1st Image: Wipe the blood off the mouth and don't prop his head up on the rifle. Consider rotating his body so his head is to your left (uphill) and let that bush obscure from the mid ribs back to his hind quarters. Another mistake a lot of guys make is wrapping their entire hand or hands around the main beams. This can give the viewer a frame of reference and make the deer look smaller. I would also tip his chin slightly down and quarter turn him to your right. Instead of taking a knee, consider sitting cross leg or on your rear end behind his shoulder making sure your left knee is hidden as much as possible behind the deer. Also be mindful of that brush creeping up over the right side of the bucks face.
2nd Image: Pretty much the same things apply here as in the first but I like what you're doing with getting the second angle of his rack. You might have considered turning it more to your left to bring out that back fork more.