As long as your under the byte size, and length x width pixel limit (whichever is smaller)...anything you put in their will be fine.
Your maximum pixel size is 96 x 96, I know that...but I'm not sure about your byte size. Just check it in your User CP. It'll say right down there at the bottom.
i'm a monster
i'm a maven
i know this world is changin'
never gave in
never gave up
i'm the only thing i'm afraid of