I don't think that would be a problem, use the IMG code or the Bulletin Board code, also called the BB code. Photobucket has IMG codes you can use. In the picture, I have attached, you can see the red arrows point to the IMG code, just copy and paste this to someone's profile page. On other sites, as shown in the second picture, use the BB code. Here's a link to a site that gives BB codes.
MySpace Comments, MySpace Graphics Codes, MySpace Backgrounds & eCards - Satisfaction