It is a nice picture. Since others touched upon the fact of outlines I will not talk about that.
The pose looks kinda plain, not to interesting. I like the shading, though. Also, I feel that the way you drew it, it looks a little too squished. I suggest making it look more rouinder. But, I think you have the basic idea. The cloud on its head also looks scrunched up. If you make those minor changes, plus fix the outlines, I personally think it will look so much more magnificent! Nice work anyway.