Great work Mark. Always inspiring seeing the ideas behind your works and the fun factor that also makes me happy just by looking at it 
I think there’s no art without ideas so I think you’re doing art, not only technical exercises as the vast majority. It’s very refreshing looking at works like this in this CG world full of Orcs, Hulks, gorillas, barely dressed CG chicks and all of that. They are sometimes awesome technical achievements but most of the time they lack of meaning, a story to support that piece of “art”. More details will never mean better work (but surely impress the “masses”, as we know). Of course I include myself on the bunch, since I’m modeling a Hulk right now (I call him “Shrek”, just for a change
).
I particularly feel more inspired checking out works like yours than an over detailed wrinkled head, where the details serve only to disguise a weak structure underneath.
So, keep up the good work sir. I’m your fan 
-Kris