The tape is what I go with. If you go with foam, stick the tape to your clothes a couple of times, so it isn't as sticky and tears the foam. Resin you don't need to worry about it
I like duct tape, but masking tape is also a good choice, which I might use for my next head. Make the tape be in small strips so you can make it go over the curves and dips on the head without getting bumps
Then mark where your patterns are, label the colors and fur direction (normally away from the nose and moving up the ears and down the neck) then you can use a sharp knife, like a box knife or an exacto knife, and scissors to cut along the head. I also put toilet paper on the sticky side of the tape after its cut out, so it doesn't stick to itself
Add a bit of seam allowance around the edges of the tape, and hand stitch the peices together, and once it fits the head like a glove, I like gluing with hot glue around the nose, mouth, eyes, and dots everywhere else to keep it in place.
I also have a bit hanging over the bottom 'neck' bit of the head, so I can sew the neck piece to it without it being as much of a hassle