You can use the LEGO Universe Creation lab, but understand that the LU Creation lab is rather restrictive when compared to other hosts like Brickshelf or photobucket.
When posting your images on here, I also suggest that you don't make them too big - images 2272 x 1704 pixels will take forever to load on dial-up computers, and not to mention it will bring up side scroll bars, which none of us like. I suggest that you resize all of the pictures you want to upload to 800 x 600 pixels first.
800 by 600 from now on, thanks, I've recently figured out how to do that in photobucket itself.