Board Thread:Support Requests - Getting Started/@comment-10861390-20140729000108/@comment-24082086-20140729065644

What 452 said was that You're not an admin so you can't manually delete it but you have marked it for deletion so an admin on the wiki might delete it for you.

So, you have no way of deleting the pic manually or with your account but an admin on the wiki will because they have the rights to do so.