Yep, just want to second that the heart doesn't read coming out of the area its at.
The proportions are in general good for the head shoulders and arms, but redrawing the chest so that the heart is coming from the middle would be a good idea, give the chest cavity more volume.
Here is a good example pulled from a google search of the proportions of the heart and the connecting tubes, look a bit more and you will have a very fun image going.
Like the style of the face a lot btw.