Uh, weeeelll.. first I'd either look around the room I was in, or go here:
http://images.google.com/images?q=room&ie=UTF-8&oe=UTF-8&rls=org.mozilla:en-US surprised fficial&client=firefox-a&sa=N&tab=wiBut otherwise.. I'm not sure I.. understand exactly how the wall's supposed to look.
(But I guess that's why you're asking about it, huh? ^^; ) It's supposed to be, like.. one of those walls that just sort of ends, right?
.......
LOL.. crap, I just made a little example, but then realized my light source is different from yours. Here's mine:
But with the light source behind the wall like that, it would be sort of the opposite.. and the plane that's closest to her, the short one.. that would be darkest, because it's facing directly away from the light. You'd probably end up making the one facing us lighter than it, just to show the shape of the wall. Also, the gradient tool is your friend. And the corner would actually have a bit of a highlight rather than have that dark shadow on it, because dark shadows like that collect in concave corners, while edges that stick out would have the most access to whatever light's floating around.
Also, some texture would help it look more wallish as well. :3 Either from a free stock texture site (
http://mayang.com/textures/ ) or just a brush in Photoshop. ^^
Hope that helps. *-*
