No you're right, the light source is off. It was more of a study then anything. I'm really new to the painting thing and I was just trying to get a better understanding on how the bone structure for the hand works.

I would really appreciate some tips on how to capture better use of light sources. (I was trying to emulate a light source on top of the hand)

Also I used the wrong terminology, I guess it's not considering speed painting. It was more of a quick sketch.