I'm not a girl so I don't have beautiful breasts use as a reference. Here's a tip, notice your mistakes and fix them now or next time. You'll want to understand your mistake and see how you can draw it better. A decent example is that her left forearm was a bit shorter than usual anatomy so I just extended it to the length I thought it was right but how about her chest?... Eh whatever, it's good enough.
#manga #blackandwhite