Fixing breast shading
Even though the breast shading is correct, they don't look nice.
The idea here is to partially edit the breast area to make the shading rounder without increasing the size of the breasts.
select the breast in edit mode
click Abnormal, and the vertices will be pre-selected
click Sphereize Normal
position the center empty by pressing G and moving your mouse
make sure the position of the center is creating this lower shading
Confirm the change
Now you have a rounder pair of breasts without making them too large