Found this great post over at Alex Castro’s site. I’ve not heard of him before, but looking at his work, he is a very experienced painter (though not a gaming miniature guy). Some great thoughts and tips from a master.
Separator:
I use a combination of flat black and red brown in equal proportions. I call this mixture soot. Soot blends in well and I use it to separate flesh from clothing and armor, or a hand holding an item or separating the fingers in a closed fist, etc. This color blends in nicely yet provides a subtle separating.…
Back Stroke:
The best line is made by moving the brush backwards, not forward, and using the sides of the brush, not the point. When you use the point you are basically detailing things and you are in the writing mode. A good technique for the back stroke is pulling backwards on the brush at the same time using the side of the brush to get the straight line as you are painting.