Most artists trace to get proportions right. But tracing can also train your eye to see value structure. The three-value trace is a simple exercise: before you draw, reduce your reference to just three tones—light, midtone, and dark. Then trace those shapes. It's harder than it sounds, and that's the point.
Value does the heavy lifting in any drawing. Get the values right and the drawing reads, even if the shapes are slightly off. Get them wrong and no amount of detail will save it. But most references are full of subtle gradations. Your eye gets lost in them. Limiting yourself to three values forces you to make decisions: what's light, what's dark, and what's in between. That's the same decision-making you need when you draw from life.
Start with a photo. Any photo. Open it in an image editor or a drawing app that lets you posterize. Set the posterize levels to three. You'll see the image break down into flat shapes of light, midtone, and dark. If you don't have posterize, squint until you can group the tones yourself. Then trace the boundaries between those three values. Don't trace every edge—just the edges where the value changes.
If you're working on paper, you can use a phone app like EchoDraw to overlay the posterized reference onto your camera view. That lets you trace directly on paper while seeing the simplified values. It's a quick way to practice this without printing.
The first thing you notice is how much information you were ignoring. Details that seemed important—texture, tiny highlights, subtle color shifts—disappear. What's left is the underlying structure: the big shapes of light and shadow that describe form. You start to see that a face is really just a few large light shapes surrounded by dark ones. A tree is a pattern of light and dark masses.
You also learn to simplify. When you trace only three values, you can't include every nuance. You have to decide which value a given area belongs to. That's a skill that transfers directly to painting and drawing from life, where you're constantly simplifying what you see.
Once you're comfortable with three values, try two. A two-value trace (just light and dark) is even more reductive. It forces you to commit to a clear light source and simplifies everything into shapes of light and shadow. This is great practice for etching, ink drawing, or any high-contrast medium. You can also try a four-value trace for a bit more subtlety, but three is the sweet spot for learning.
Before you start your next drawing, do a quick three-value trace of your reference. It takes five minutes. Then, when you draw, keep that simplified value structure in mind. You'll find your drawings read better from across the room, and you'll spend less time fiddling with details that don't matter. Tracing isn't just about getting the outline right—it's about training your eye to see the big picture.
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