pretty nice? It's hands down mandatory for sculpting.
For digital sculpting, sure.
I've never really found digital to be as incredible as traditional, though. Fixing mistakes and replicating symmetry/etc via digital sculpting is ridiculously simple. It's efficient and therefore appropriate for business practices, but on a level of expertise, I'd say there's no doubt traditional sculpting is significantly more difficult and requires much more competence.
That being said, really love your stuff. The stylized aspect to your work flows so well. There are multiple perspective issues with some of these works, a sort of "flat" feel, if you will, but it seems to work given the style alone. But when you mesh with more realistic illustration, it's much more apparent and much less appropriate (still on a very small scale, though). If you want specific examples I'll provide them. I'm under the impression you're open to constructive criticisms.
