I studied the photo for about two minutes and conclude that the bigger deer is actually behind the smaller deer, so it couldn't be the camera angle. I think that the small one is a young deer with very good genes and has the potential to be a true trophy class buck if allowed to live 3 more years or so. The bigger deer is a much older buck, look at his belly line and the pronounced brisket. Just goes to show you that each deer is unique. The smaller deer does not have much of a brisket yet and the space between his front legs is very narrow. He is probably only going on a year and a half old. Or they could both be tiny, look at the gigantic legs in the left of the photo, (hehe).