Re: Voltlight's import tutorial - Updated with video 14/05/2011
Just look at some images, see what other artists do. Shadows tend to be opposite to the light source, of course, although there is no obvious light source in SDT.. I tend to do the edges of the hair facing the guy, in general, and anywhere I imagine the hair to be covering sections of her head. Generally I'm following quite a few references for my work, so I can always just average them out, see which shadows are dominant on that character.