When can I make my avatar's dimensions not that of an emoteicon?

I guess I'm also supposed to introduce myself. I'm Andrew. I like a lot of artists.
I like Bowie, for those of you who don't know my username from anywhere.
ok list artists
Angst Hase Pfeffer Nase, Bauhaus, Beatles, Bjork, blink-182, Box Car Racer, Brian Eno, Bright Eyes, The Brobecks, Can, CRUX, The Cure, Daniel Ash, David Bowie, Doz1jeE, Fall Out Boy, Forgive Durden, The Front Bottoms, fun., The Glove, Iggy Pop, Joy Division, Lou Reed, Lizzy Mercier Descloux, Love and Rockets, The Love Language, Marc Bolan, Matt & Kim, Matthew Larkin Cassell, Menomena, Mick Ronson, Midtown, Mini Death, NEU!, Neutral Milk Hotel, New Order, Pencey Prep, Seatrain, Siouxsie, The Smiths, Wendy/Walter Carlos, Streetlight Manifesto, T.Rex

and i guess thats not it but i just kind of ran through itunes bleh
yes, i looked through the newcomers guide and i now know how to have a pretty avatar, no thanks to you