i just made this as i went along, with out a template, so i will try and walk you through it.
first you need to cut two sides for the head like the picture below.
then use a tape measure, and measure around the head (but not the back), then cut a long strip for the middle part of the head, then pin all three pieces together and sew with your sewing machine. then turn it inside out so the rough edges are on the inside, now check the head shape is ok. then turn back inside out and lay on a piece of fabric for the back. and pin it and stitch all the way around, leaving the bottom part open, and then turn the right way again and stuff it. now put to one side and draw two antlers, and then stitch two pieces of fabric together trim off excess and turn inside out, and stuff these.
then i found that they were a bit floppy, so i made two small holes in the stags head and inserted a pencil half the way in, then with the antler i folded the rough edge in, and slipped it over the pencil, then hand stitched it to the head
then i made two little ears and stitched them on.
then in the hole at the botton, i inserted some cardboard up the back so that it was flat, and folded the rough edges in and stitched it up. this makes it a firm base to hang it to the wall.
then you have your plain stag head, next to make it look like grain sack material i stenciled on words. i put masking tape along the seams so that the words didnt cross over to another of the sections.
then i made two small holes in the back and slipped a cable tie through it so that it could be hung on the wall.