The colors are very rich, and as I've commented, I love how much you make this look like paint. It just seems so...lively and animated, despite being what looks like an animated skeleton (I don't know the character)
A few things though. First of all, I don't know if they draw her like this, but human elbows don't look like that. You've put what looks like a patella at the elbow joint. There is no such bone.
Also, the necklace doesn't really seem to line up right with her neck. If she's leaning to the side, yes, it might hang like that, but...I don't know, it just seems off. Plus, notice that the left side of the strand of the necklace disappears as it passes under her left hand. In addition, her face is sharper than everything else, the necklace is blurred in comparison. It's inconsistent.
Also, her right shoulder, maybe it's just the angle, but it looks like the bone is touching her neck. Is she shrugging? Because if she's shrugging, the right side of the necklace should sit higher, unless the character lacks scapulae and clavicles. And in a shrugging position, yes, the bone might be that high.
The reason I put originality down is simply because you didn't make the character, no other reason. It's not a comment on your artistic ability because you are very talented and I enjoy your work.
As far as technique, your technique is very good, but as I said, it appears to be inconsistent within this. Impact and vision are high because this is a very pretty piece to look at.