I'm a bit tired so I'll try to keep this short and simple

Have you got a picture refference of him? To help you with his current stance, if not it'd be a good idea.
Where's the light source coming from?
I think his torso could do with some correcting as his chest doesn't quite look like that some working on that would be a good idea as could his face.
Could you also provide a color palette because I'm a tad to lazy and tired at the moment to collect one from the image haha.
His current stance isn't exactly correct either as his feet don't seem to be pointing in the way that it should be. So turning his right foot round a bit more could help quite a bit, some dithering could be benificial for his purple tail / stomach.
That's all for now.