I'm surprised that Imgur's gallery comment feature does not support hashtags. It would be a great way to link people to other pictures. You could even incorporate the hashtags into the voting system. Let's say I put #imguraffe on a picture of a giraffe with a green hat, and someone else puts #imguraffe on a different picture of a giraffe with a monocle and tophat. Someone clicks... c licks (I don't like the way your font makes "cl" look like a "d") either hashtag and sees a similar picture... they could upvote the comment(s) with the hashtags. Clicking on a hashtag link could bring up search results listing from the highest voted hashtag comment to the lowest. Just a thought.
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