My first attempt at an enlargement.

[LavishLizzie]

http://i742.photobucket.com/albums/xx65/SoggyCheeriosx/AndyLizzie.png
Shading is a bit off.

[lRhyss]

oh wow they're great, well done :D

[David]

its very flat
you need highlights and more shading

[Liva]

I commend you on achieving a good result first of all, because I've attempted it before and I just got so confused and gave up.
But I do agree with the above comment, a little more detail would be great. :)

[TheJokerEffect]

That is a great er 'enlargement' I actually quite like it and that cartoony style <3 Congratulations on a great job :P

[!x!dude!x!2]

It's really good for a first time job :P you should do a lot more :) keep it up

[19M7]

Left side of both of the avatars look really flat. I like the shading so far though.

Good job overall. Just work on the left side and try create a focal point maybe.

[Landon]

Good job! Like everyone else, the shading is the only issue you are having :D
Well done!

[-Moniquee.]

Oh wow! I commend you for this being a first time you've done this sort of thing! Keep the good work up.