The breast area is a bit skewed to her left side, but otherwise, this is quite lovely!

hi thanks for noticing...i just make some fixes...hope breast looks ok now???also added sbs.

The "cleavage center" between the breasts is still off-center. It should be matching up with the center of her clavicle above it.
It is also quite flat looking. Since breasts are spherical and extend out from the body, you need some values of shading beneath to give the illusion of form and depth.

great drawings...best of luck

hi thanks to all the comments,it'll help me improved...i will make fixes on the breast area try to make it more look larger though i'm flat chested hihi...kidding!!!