Here’s a handy chart for converting between Vallejo and Games Workshop’s Citadel Color paints.
painting
Vallejo Model Color to Craft Paint Equivalencies
Vallejo model color is considered by many to be spot-on accurate for painting historical colors, but it’s so doggone expensive.
Here’s a page with information on converting from Vallejo to Delta, Folk Art and Apple Barrel Craft paints.
Blacklining Tutorial
Jenova offers a page with a tutorial on using the blackline painting technique on your miniatures.
The Grey Scale Technique For Fleshtones
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 A 28mm Mercenary Hoplite
The Ancient Battles site offers a nice article on building a Warhammer Ancient Battles mercenary hoplite unit for a Persian army (for use with the Alexander The Great supplement). The author uses a variety of painting techniques, and there are some nice photos.