Whereas this should probably be in the photography forum, I'll try and help anyway. I would certainly prop up the head on a rock or a stick or something----then we can all see how big it is. Make sure you fill the whole frame with the subject, and put your bow and maybe the kill arrow in the shot. If your using an SLR, you can adjust the exposure a bit according to light conditions---less exposure for direct sunlight and more for darker conditions----and a warming filter helps a lot, too.