Just click the pencil icon next to your avatar, and upload a new one. It should change as soon as you update it. You can also change it when you click to edit your profile page, an Update button should show up next to your avatar.
There should be a little cigar like near your pix that you can press, ThisBeautifulGirl... however, I had this problem Once on my own laptop but eventually it just corrected itself and I was able to do another profile. Good luck. xx