1)you would be good at anime.
2)for the breasts. Look at pictures, and notice that the outline of the chest isnt where the breasts are defined. for more realistic, Im guessing this is what you want, just add shadowing and folds into the shirt, don't try and actually draw them.
It takes awhile to figure out how to do certain body parts. looking at other peoples drawings, and studying the lines and shadows and where they are helps.
2)another thing I can see is your sholders. Instead of doing shrug sholders, draw the neck, stop. And just under the neck draw collar bones. then continue the neck, down over the collar bones. Starting the sholders either after or when the collar bone ends. If you just have a head study, of a lower shirt, turn the collar bone line into shadows. Look at your own in the mirror for help.
ex:
3) Spend time looking at your self in the mirror. Trace what you see with a finger over the glass, or skin. Look at the basic lines and how they change when you move or change perspective.
4)
Drawing on the Right side of the brainis the best book on drawing you could find. I really suggest getting a hold of a copy.