The breast looks fine. The gun is blocking the right one and it's in shadow while the left is visible and in the light.  As ockham said the arm is pressing against it and not only moving the breast forward but also the fabric: a perfectly natural occurance.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi