Gargoyle head

This was another costume thing I did to be worn on the head (I just have a thing for dressing up in OTT fancy dress outfits).
I'm one of the few people I know who sculpts in corrugated cardboard (there are others out there, but you don't see it that often). I slice up ordinary cardboard boxes with a scalpel or stanley knife and then edge glue them together with hot-melt gluesticks usually.
For this, I wanted to do one of the gargoyles from Notre Dame, and I almost nailed it, although the one I based it on has a much heavier brow.
I would sculpt more in this style but when it comes to selling my work, I find people just seem to add up the cost of the materials I make it from and think it should cost the same as a cardboard box and some glue, which makes me mad! Craft skills and time spent on it are never really factored in.