@silentheart00 Be careful with the traps, they are one of the best ways to make a character look too muscular. Imo just move the head down. May be a case of the model looks better with a shorter neck than the 2D. Then again the long neck might just be the style you are going for, I think only you will be able to judge that. in the end.
The rib-cage you are trying to define seems really flat and low. From the centre the rib cage needs to start just a few inches below the breasts and then curve downwards as they go out, reaching the lowest point at the sides. If you imagine that your character has well defined abs, try make the ribs hug the top of the abs and curl around a little bit