That is some of the best drawing I've seen from a newb as you call yourself. It's like raw unbridled talent just waiting to be harness. Good job so far. Just keep practicing.
Yeah man, that's some snazzy stuff there. I personally like the guy with the demon on his back; you should definitely post more of your more realistic art more often.
Also, you say you're modeling your characters after Machall? That's fine and dandy for your cartoon work, but what about your more realistic sketches? Who's your idol in that department, cause i'd love to know.
In case you're wondering, I hope to model my characters after Inkthinker some day (type that name in DeviantART in case you're interested), so it'd be interesting to look up your role model and see how he approaches the human figure.