Haha, alright. Let's make sure that you know first and foremost that this is a really nice piece! The texture is good, the composition is good, and overall it just really grabs the eye.
That said, there's some technical issues I'd point out. The most obvious one is that it's kind of lacking in finish. There's a lot of rough edges, I feel that going in with a small high-opacity brush for a couple of minutes would've made the overall look a lot more clean and readable - even if you might've been going for a more painterly look. That said, the texture you achieved in certain areas (particularly around his 'core') is fantastic. The texture doesn't work very well for the legs, though, some more definition would go a long way in making this guy look more credible.
There's another two things that I'm not sure about, though I feel as if they're related. I think the most pressing issue is the lighting consistency; there's not really any clear light source despite the pure white. I'd really like some more emphasis on the rimlighting around his head and core, giving more depth and definition to the creature as a whole. Furthermore, there's a pretty big issue with the left shoulder; the way the shadow sits from the shoulder to the lower arm, with very little gradation, makes it look flat, and that just throws off the creature's anatomy. A more gradial (if faceted) approach could really work wonders on making it look more volumetric!
That's all I can see. You're well on your way as an artist, and you can tell you're doing your studies. Keep it up!
