The "carving" is done with a bench sander (mainly the belt, often at the curved end), hand held RO sander and the dremel with a small drum sander attachment. Some woodcarving chisels may have been useful (note to self for next time).
Knowing you've achieved that with reasonably crude tools, I'm even more impressed now!

I could only further impressed if you had said you did it with "stone knives and bear claws"