How to Blocking in Shadows for a LARGE Painting

Learn the art of blocking shadows with acrylic glazing for dramatic depth in large paintings

When creating a large acrylic painting, one of the key elements in bringing it to life is mastering the shadow work. Blocking in shadows helps define the structure and form of your subject, adding realism and depth. Using an acrylic glazing technique enhances the shadowing effect, keeping it translucent while still maintaining control over the darker areas of the painting.

In this blog post, we’ll explore a step-by-step approach on how to block in shadows for a large painting. We’ll cover the essential tools, glazing methods, and tips to help you create a more dynamic, realistic piece of art.

Setting the Stage: Preparing for Shadow Blocking

Before diving into the painting process, it’s important to prepare your materials and mindset. I begin this painting session with a moment of reflection and prayer, setting an intention to create a work that captures emotion and depth. Preparation also involves setting up the canvas, sketching the outline of the subject, and sealing the sketch with a light glaze.

For this demonstration, a mixture of raw umber dark and ultramarine blue was chosen for the shadow work. These colors, when blended, create a rich, cool tone that is perfect for shadows. Here’s how you can apply this to your own painting:

1. Prepare Your Canvas: Start with a white canvas, sketch your subject, and seal the sketch with a light glaze using diluted acrylic matte medium.
2. Choose Your Colors: For shadows, a mix of raw umber dark and ultramarine blue works beautifully to create a cool-toned effect. These colors blend well and offer the right balance between transparency and opacity.

Step-by-Step: Blocking in Shadows

1. Creating the First Glaze Layer
   Begin by applying a diluted glaze over the areas where shadows will be present. For large paintings, it’s important to keep a wet edge during the application process to avoid streaks or unwanted lines. Using long, sweeping brushstrokes, layer the glaze in areas where you want shadows to appear.
2. Maintaining Translucency
   The beauty of acrylic glazes is their translucent nature. You can still see the sketch beneath the glaze, preserving the fine details as you work on the shadows. To achieve this effect, ensure that your glaze mixture has more medium than pigment, allowing light to pass through.
3. Building the Tonal Value Structure
   Blocking in shadows is more than just applying darker tones. It’s about understanding the value structure of your reference image. In the demonstration, the artist frequently checks his reference photo to ensure that he’s accurately representing the light and shadow interplay. Study your reference carefully and build the shadows from light to dark.
   • Tip: Cooler tones work well for shadows. Add a small amount of ultramarine blue to your glaze to give the shadows a cooler, more natural effect.

Techniques for Shadow Blocking in Large Paintings

Blocking in shadows for a large painting requires a few specialized techniques. Here are some essential methods to use:

1. Layering Glazes for Depth
   Rather than applying one thick layer, build your shadows gradually by adding multiple thin layers of glaze. This will help you control the depth and darkness of the shadow, while still maintaining the luminosity of the overall painting.
2. Vary Your Brush Strokes
   As you apply the glaze, it’s helpful to vary the direction of your brushstrokes. This creates a more natural and organic look, especially in areas with fabric or textures like rocks. For example, the artist worked on the figure’s clothing, carefully brushing in the shadows to maintain the folds and creases.
3. Use a Smaller Brush for Detail
   Once the large areas are blocked in, switch to a smaller brush to refine the edges of the shadows. This technique allows you to add subtle details that make the shadowing more realistic.

Key Tips and Techniques for Effective Shadow Work

• Keep a Wet Edge: When applying a glaze, always maintain a wet edge to prevent harsh lines and streaks. This will ensure smooth transitions between the light and shadowed areas.
• Use Cooler Tones: Shadows should be cooler in tone compared to the lighter areas. Adding a hint of ultramarine blue to your glaze helps achieve this effect.
• Layer Glazes for Control: Don’t rush the shadowing process. Build up the intensity gradually by applying thin layers of glaze until you reach the desired depth.
• Pay Attention to Gradation: Shadows are rarely uniform in tone. They often fade or blend into lighter areas. Adjust your glaze to create smooth gradations between light and dark.

Applying Glazes to Specific Elements

In the video, I focused on several parts of the painting and then demonstrated the blocking in of shadows:

1. The Figure’s Clothing: By using a combination of raw umber dark and ultramarine blue, the artist darkened the folds of the figure’s clothing, preserving the highlights and lighter areas.
2. The Rocks: Shadows were added to the rocks behind the main figures, using a slightly bolder application of glaze. The cooler tones gave the rocks a natural shadowed effect, which contrasted well with the lighter areas.
3. Background Elements: Blocking in shadows for the background elements, such as the sky and distant stones, helps create a sense of depth and distance. In this case, the artist allowed the shadows to blend naturally into the lighter tones, creating a balanced contrast.

Finishing Touches: Refining the Shadows

Once the shadow areas are blocked in, the final step involves refining the details. Then I used a smaller brush to control the finer aspects of the shadows, ensuring that they didn’t overpower the highlights. This delicate balance between light and shadow is what ultimately brings the painting to life.

• Pro Tip: If a glaze feels too bold, you can always lighten it by gently brushing over the area with a bit of water or clear medium to soften the edges.

Conclusion: Mastering the Art of Shadow Blocking

Blocking in shadows is a crucial skill for any artist, especially when working on large paintings. By using acrylic glazing techniques, you can add depth and realism while preserving the underlying details. Remember to take your time, build the shadows in layers, and constantly refer to your reference photo to ensure accuracy.

Master this technique, and you’ll find your large acrylic paintings gaining new levels of dimension and realism.

If you’re looking for more instructional videos on how to improve your acrylic painting, visit www.realisticacrylic.com for more tutorials and check out my free courses here. .

LEARN MORE

• Adding highlights to your acrylic painting
• 5 Excellent Reasons to Use Aluminum Foil
• Paint Realistic Wrinkles in Acrylic
• Painting Clothing in an Acrylic Portrait
• Paint a Cloudy Sky Acrylic  
•  How to add Semi-Opaque Highlights
• How to Enhance the Contrast in Your Acrylic
• How to Add Glaze to Your Acrylic Painting
• Paint Realistic Reflections on Eyeglasses in an Acrylic Portrait
• Build Up Depth on Your Acrylic Portrait Backgrounds
• How Do You Do Layers With the Glazing Technique?
• Learn How to Paint Wrinkles in Acrylic

Read more about how to paint a portrait that you can surely be proud of!

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Yours for Better Portraits,

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