The question isn't quite clear. From what I can gather, you're asking what part of the camera will allow Jake to review his photo. If so, the answer is the playback button. If this is not what you were trying to ask, please elaborate and make yourself clear.
Proportion is the relative size of objects as compared to other parts of the piece. Balance is the arrangement of the elements within the piece that give it an aesthetically pleasing equilibrium for the observer.
