Thanks for the tutorial. I use a relatively similar technique, and to decent effect, it's just the shaping of the nose and lips I've had trouble with, so until now I've just done masks that didn't cover those areas, just like the one featured in your tutorial. I did note that you cut the eyes out after you have done most of the shaping. That makes sense for achieving more accurate placement, although I've always found leather easier to cut accurately and symmetrically while it's still flat. My order of operation is Cut, tool, shape, (dry,) paint/dye (haven't tried airbrushing yet).