This is pretty cute for a first drawing. The only thing I can really draw well are stickmen.
Pikachu will need a diaper change after its nap. lol
Technically, wouldn't it just be a pichu in diapers, since that is a baby pokemon?
Really cute. Nice block colouring. Also, did I mention I think it is extremely cute?
The lineart on the face and wings isn't terrible by any means, though I'm assuming you used a reference. The perspective between the left and right wing is a bit off, though.
Your technique for the colours needs improvement though: I think you need to practice more and possibly get some better quality equipment. At the moment it looks "scrappy".
All I think about the limbs is he looks like an amputee. Sorry. :P
This highlights the need for you to work on shadow and texture. The diaper doesn't really resemble a diaper at all. And unless you know what you're doing, large areas of solid colour tend not to work too well.
Apologies if I seem overly critical, I want to help you improve, I really do! I'd recommend you start by doing some studies of human and animal anatomy. :3
The key to becoming a good artist is drawing lots of things, from observation. Look at reality, and look at what other artists do with it. Then combine that with your own ideas.
Any more Pokemon in diapers that you are planning to draw? Like a Squirtle or a Cyndaquil or a Teddiursa?
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Not really sure at the moment. Have a request?