Background

Good job, I like the glowes, but dude...too much blue color...even eyes are blue xD . Ok, probably if you change background style to gradient or radial or even solid(by keeping blue), it will look better that these tiles, i think =)

Nice work! :D

You've done the shape and poportions quite well but I think you should work on colours a bit more. Placing a blue character against a blue background isn't a very good choice because it makes it hard to see the character. You should try adding more scenery instead of a simple background like you have done. The head seems too big for the body. The font/text doesn't look very good, it's hard to read and doesn't fit the style of the character. You should draw your text next time instead of using the text tool. I think the colours you've used are too bright and you should reduce the saturation a bit. The shading is done quite well, not perfectly, but you'll definently improve with practice. I look forward to seeing your other work :)