Suggestion/feedback regarding ambient shadowing

I guess its kind of pointless with feedback since it's just concept art. 

I don't know how much focus you guys will have on ambient shadowing in the next game, i hope it will be some focus on it cause it makes things look better. Also since its quite decent amount of it in the image probably it is.

In the image attached i marked some spots/objects in blue that seem to cast ambient shadowing, red seem not too cast onto ground or other objects. Fully understand concept art lacks things like this even if its your guys plans, but wanted to mention it regardless.