While there's a lot of good information above, am I the only person who thinks that the shadows in this image actually look pretty good? The figure's right breast shouldn't be showing a bit more shadow than it is, and the left breast's dark penumbra is exactly where it should be. Yes, south of that line the breast is showing some reflected or ambient light instead of the dark shadow you see on the arm, but it's not nearly in the same plane as that arm, and this kicked-back light (slightly green, as if reflected from the grass) looks like something you might well see out-of-doors.

I'm persuaded it might be a little darker if not for the shortcomings of shadow-mapping. But IMHO it looks great just the way it is.

Another Bill