there are two ways that you can put ur character on. (that i know of) first way is the easiest way. go to maplestory rankings and find ur name and picture on the rankings. simply copy and paste to ur picture file. after that, there is a little button on the menu bar that says "profile" then click on the avatar. click the little browse button and click on ur picture and ur done.
the second way is the bannedstory way. bannedstory is a maplestroy simulator that helps u make characters any way u like (i use banned story) and then u save the picture, then use the way on how u download it (second part in first paragraph)