This is quite good for a first thing in photoshop with a mouse...are you sure you aren't lying to us?
Anyway, there are only a few points that I would have some issues with, notably, it isn't yet "tight" enough, perhaps some sharper detailing shadows/highlights, and contrasts. Likewise, you may want to make some edges on the piece, since it looks a little 'splurty' right now. And the foreground arm is a little short.
({spler-TEE} = to be splurty, having splurts or blobs and not being tight. But instead being splurty.)
-Dictionary of Elenaish, (el-len-{Nay}ish)-