Animal Jam Masterpiece Sketch (critique very much encouraged)

[December_W_Wolf]

On both versions of Animal Jam, you have the ability to create in-game "den" (house) items called Masterpieces using the built-in art program. Now, since this particular one is for Animal Jam Classic, for which the art program is very rudimentary and genuinely worse than Microsoft Paint, I've taken to drawing sketches beforehand in CSP and using a program to essentially overlay it over Animal Jam so I can just jump straight to the lineart once I boot up the art studio. Here is one such sketch that I have finished just a few minutes ago, and would like some fresh pairs of eyes on this. I don't think there's anything particularly wrong with it, in fact I quite like it, but it doesn't hurt to get some feedback while you're at it. Perhaps some things need to be moved around, maybe the anatomy's a bit strange... I'll also be making a couple more of these using different animals as references, so if someone does point something out I can then incorporate it into future Masterpieces!
Anyways, enough yapping, here's the actual image:

Do please ignore the painting program underlayer, this is just to put the sketch into context and make it fit the dimensions properly. It was very much NOT drawn by me... that said, the little penguin's quite cute, haha!

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Edit: Note that I do not wish to change the otter's clothing or name, as it is fully based on a real player's avatar, and I intend to gift it to them once the Masterpiece has been completed and approved by the Animal Jam staff. Critique of anything else is welcome, though!
Edit 2: I should probably clarify that when I say "name", I specifically mean the contents of the text, I am very happy to change the font to something more legible if advised to.