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Her torso is at a bit of an angle, and I think her right breast is doing okay with that angle. The suggestion of it is subtle, but it's there, and at the angle, I see no reason for it to really protrude one way or the other.
The issue I'm seeing is her right arm. With her body at that angle, that arm should be a bit thicker. The blue of her top seems to be overlapping part of her arm too, and that should definitely be the other way around. Her arms should be overlapping her torso just enough to show that it's in the foreground.
I dig on the mostly not outlined style. And it seems like the rest of the style, the slickly blocky shoulders and simple lines of the jaw in sort of a cartoony, perhaps anime style works for the piece, but that arm is causing most of your trouble, and it'd be easy to fix within the style of this piece.