Jewelry and trinkets are tricky to draw because without the proper sheen on the metal, they look flat and texture-less. To practice, try your hand at adding a metallic gleam to a simple shape.
First, select three colors—a midtone, a shadow and a highlight. With highly reflective surfaces, the highlight will almost be white, while the shadow is extremely dark. The sharp contrast between the two captures the feel of a reflective surface.
Decide where the light in your picture is coming from. In this example, the light comes from the right of the sphere, so the highlight is on the right and the shadow tone is on the left.
After setting in your three main colors, fill in the shift in hues between them. The transition between the different colors mimics the play of light on the metal.
The darkest shades on the sphere won’t go all the way to the edge. Since the sphere reflects all of the ambient light in addition to the light source, make sure to keep a lighter golden hue at the outer rim, even on the side in shadow.
Objects with a high metallic sheen can also reflect colors that are in close proximity. If your sphere is near another object, add a hint of the same color in the direction of the object.
You can suggest a metallic shine even with black and white ink. Try something similar to this dress. The dips and valleys offer a lot of opportunity for deep shadow, while the ridges have very bright highlights.
Not all shiny objects are created equal; different surfaces create different levels of sheen. For example, here the feathers are metallic but textured, the top is a worn-looking antique gold and the skirt has a high shine.
You don’t have to limit your metallic hues to gold and silver. The same basic technique will allow you to give any color a metallic look.
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