Two good videos on using a wet palette for painting.
Painting
Painting Flesh On Miniatures
I have long had trouble getting large swashes of flesh to look right. This video is helpful.
The Complete Future
Matt Swan has a web page describing all of the varieties of Future acrylic floor wax, and their uses in modeling. Miniature Wargamers, of course, have discovered the use of Future in making washes that easily provide shading on painted figures.
Painting White
Painting white as the primary color of a miniature is hard. The video above offers some good tips. As does this one below:
Using Washes To Create Weathering
Armorama has an article on using washes to weather your armor models. While its intended for plastic modelers, it also is great advice for 15mm and 25mm – 28mm gamers. I’m not so sure that it would be useful for anything smaller, though.