The idea of the grey scaling technique is that as things move into shadow, they don’t just become darker — they also become more grey. Here’s an article on how to apply that idea to flesh tones.
Painting
Advice On Lighting For Your Painting Table
Massive Voodoo has an interesting article on which light to use for painting. I used a halogen light for many years,
Painting Freehand Details On Miniatures
Creative Twilight has a blog post on painting freehand details on miniatures, such as logos on crates and the like. It fits in well with my thesis that painting miniatures is a skill that can be acquired, not a talent.
Painting Ethnic Skin TOnes
Cool-Mini-Or-Not has a good article with pictures on painting non European skin tones. There are photos of the various peoples, along with virtual paint chips and a discussion of how to replicate those tones.
Undercoating Your Miniatures
When you’re painting a house, it’s said that the preparation is most of the work — and that poor preparation will always result in a poor outcome. I think the same may apply — to some extent — to miniatures. A poor undercoat ruins your figure before you even start. Too much primer, too little, too slick, too grainy. There are a million ways to ruin a figure. Here’s an article on the subject of undercoats.