This particularly caught my eye as a very unique piece. I think it's very different, to say the least. I do like it. However, there are a few problems, albeit small. Around the chest, there appears to be a piece of flesh protruding from the left side. It makes the shell, which you obviously spent a considerable amount of time on, look either too small or in the wrong place. With shells (or any item for that matter) that wrap around the abdomen and not the back or sides, you will generally want them to fit the shape of the body exactly. Otherwise it will either make it look like there is excess flesh at either the chest, thighs, or both.
The knees look a bit strange stretched the way they are although the proportions are nearly perfect. The way the thigh on the right side is turned, it nearly looks like there is no distinction between the leg and the abdomen. Nothing major, though.
The neck seems a little... muscular in the back and it seems as though this could have looked a little more precise if the head had been nearly leveled and the neck reduced.
The instrument is a nice touch, but I don't like the shape of it. I think it would look nice if the fingerboard had been shortened, widened, and straightened. The current arrangement isn't bad, but it kind of makes the piece look imbalanced.
And it looked to me like some sort of dinosaur x cow x cello; am I correct?
Overall nice piece, just wanted to comment.