I think the best way to get a sense for light and shadow is simply to study the things around you, and photographs. Study portrait photos and friends and family, even have a friend sit down with a single light source and look at how the planes of the face/folds of clothing/etc. work For commissions like this I don't usually use reference but for more complex paintings it's best to not work completely from imagination.
Magnificient! What a stunning way of coloring, his features are so smooth and refined. I adore the concept of this character and the sleek brightness to his skin and hair besides the impressive outfit design!
Soooooo you just made my life amazingly more easy so you know! I used to do layers and paint higlight butn etc...this is soooo muitch easyer!! BTw do you worcke for Fable or sompthing becuse I instently thoght og it when looking at your worcke, thats a good thing btw it whas the whole reson I bought an xbox