The easiest way to photograph a coin head on is to back the camera up a bit and position the coin in the corner of the frame. If you're far enough back, the coin won't pick up the camera in it's reflection, and you'll be able to put a reflector right above it to get the highlight you want.
Can you put a picture on a coin?
Photos can add unforgettable detail to any coin design. Using the diestruck coin process can limit the detail that can be achieved when adding a person's likeness to a coin design. Metal lines are used to create the details of the images which can leave the image almost unrecognizable.