When I write out my own proofs by hand on paper, I use my own personal variant of Q.E.D. / square to finish out the proofs (its a cursive version of my initials).
I've doodled up this icon on paint and want to insert it into my proof environments in the end as its Q.E.D. symbol.
I know how to change the symbol to whatever using
But I don't know how to extend this to use an image file rather than text. Any advice appreciated!