if you want even more critic, id say, do more faces. i think you have a really solid style and technique, but the human faces arent at the same level as the rest of your stuff yet. i try to say this without sounding condesending or anything, im secrectly a bit jealous of your progress rate :).
Alright! ENOUGH SLACKING! Time to get back into this! :D Looks cool everyone! Did a bunch of face studys/practice stuffz, here is the two best of the pile: