I have answered quite a few posts with pictures/images. Is there a way to search MSE so that it lists all my posts, where I have used an image/picture?
This query should retrieve all your posts with images. It finds 72 such posts for you; let me know if any are missing. (Some very recent posts may be missing, because data.SE is not real-time.)
I would also try good old Google: for example searching for something like imgur user17762 site:math.stackexchange.com. Of course, this does not return only your posts - it includes the post where you have commented, other answer had picture etc. But if you are trying to find a specific post and you can think of other possible keywords to refine your query, this way might be useful.
Maybe even trying to use the same query in Google Images might be a reasonable idea. You will see the images there, so this might be handy when looking for a particular post (or for a particular picture).
Note that searching for user:17762 imgur using SE search engine does not return anything.