My #1 concern with those tree is the way branches look like a stand for the canopy. they will sub-divide hidden from our eyes, so imho, they should not go beyond the central third of the canopy's size.
As for spherical and shading, trees often give the viewer a flat look because they have irregular shape, so I wouldn't mind they'd look non-spherical here. At best, you'd have clusters of leaves that are in the shadow. I'm more concerned with the inconsistent light source amongst the character and level elements.