[Restavega]

Now I think I am confused by what you mean...

Do you two mean the lines going in the same direction (which is what I am assuming) or do you two mean the shading be on one side of his face (as if the light is hitting him from one side).

If you're suggesting the second one, then I'll tell you that the light is hitting him from above (he is outside and the sun is above). I'll gladly draw a picture of the light coming from one side if you want to see one direction of shading. But if you're talking about me putting the shading on one side as a sense of style, I don't think that's appropriate. You don't just put the shading on one side because it looks better. Besides, this picture is a concept so there is no right or wrong as far as incoming light is concerned.