Well my skinks have an interesting paint job,
basicly I prime black (white would work too)
then I paint their bellies, chest, back of legs,
and underneath their airms blue, then I blend the
color to a bright green on the other side of the model,
to do this I do a semi dry brush the colors, while
slowly changing the ratio of blue to green as I work my
way around to the other side of the model...
I know this sounds complicated, but it practice it's not that hard.
Look over at my paint blog to see what I am talking about.
Ps. mixing your colors on a pallate makes the whole process a lot easier.
also you are going to want a little bit of water on your brush, but not much.