I think you could use some sort of light grey, thin it down (if you can find a grey ink that's great) and paint it in the recesses. By using some mixing you can go gradually darker though it might not even be necessary.
That's how I do it. You can also wet-blend up from an ink by adding more and more white. This creates a great dither effect with no real discernable lines of color but it does tend to be dark and quite high-contrast. Looks really cool IMO, although I don't think I'd use this trick to do something I wanted to be mostly white.
First use oil paints...artist oils, BURNT UMBER. Then cut (mix) the oil paint (use very little) with turpenoid or Graumbacher's oil painting medium 2 in a small shot glass. Make sure that the mixer is loose, not heavy with oil paint. Use a controlled wash method which means you use a fine tipped paint brush and hit ONLY the crevasses you want the shodow in. After a day of dry time, you use flat clear coat. THis not only flattens the subject, but protects your model too! OH yeah, I forgot ONE important step......before you use the wash, ALWAYS ALWAYS ALWAYS spray on gloss clear coat. this makes the suface smooth and the wash glides on.
Im telling you it works! just look at my stuff in the gallery! good luck......I bet now you are more confused! LOL :huh:
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