The proportion of her hand and the shadow on the wall contributes to the fact that the light should be coming from underneath her. If it was coming from in front the shadow of her hand on the wall would be down a bout a foot.
You know, you're probably the perfect person to ask this of :
What do you think of Vicky 4's breast morphs vs Vicky 3's?
I'm tending to find that Vicky 4s morphs aren't quite as good as Vicky 3's. Her 'base' breast morphs tend to give them a 'torpedo' look when dialed up to "1", although there are third party morphs that tend to correct this somewhat.
The problem is that it's a stock figure based just on surface geometry, not skeletal geometry, muscle geometry and so on, and so it could either be designed to optimize clothed, supported breasts or unclothed, natural breasts. DAZ chose the former.
I think the breast geometries on the two most recent Victoria models are effectively about the same.