whether this happens or not, remember you can ask a sandbox mod or a site mod to delete the post for you! You can just click the little head next to the view counter and type in your username to find all posts by you, and link that to a mod.
Also, make sure to check for any posts people may have quoted with your picture, because those can exist too. (On the community subforum, just search for your username. It'll show all the times you have been quoted)
Also, you can directly delete the picture from imgur if you have an account. On the right top, mouse over your username, click on images, and from there you can delete any uploaded images that you uploaded through that account.
Ex.