humerus: is that her upper arm? I think perspective wise, her upper arm should be a bit bigger. It is closer to us. I think this will fix the arm and shoulder looking aqward.
Taboo is right about the pinky. Listen to her, she knows what she is talking about. I think the thumb could use a bit of work. It's ok, but it looks more like another finger to me. slender, when it should be more plump and thumb like.
I personally think her breast is fine. It's not a big issue even if it is, becuase that is not the focus of the picture and is covered mostly by the arm.
I do have an issue with the rib cage though. Imagine she didn't have a boob and you just had to draw her rib cage from this angle. The line from her waste going up is at too much of an angle and needs to be adjusted slightly. This is my comment without looking at references of a female from this possition. There is a lot going on with the body at this spot, so it is tricky to put everything together and make it look good.
The waiste is disproportioned; I'm gonna take a guess that this is Nami. In this case, Oda's women always have disproportionate wastes, so in this case, I think you can get away with that.
Your very good at drawing heads and faces Cosmic. You've impressed me. Good luck with your pic.