photo comment

 photo comment  is what a photo reply looks like in the context of the original post that it is in-reply-to.

multi-photo comment
Similarly, a multi-photo comment is what a multi-photo reply looks like in the context of the original post that it is in-reply-to.

IndieWeb Examples
Examples of IndieWeb sites/posts showing photo comments on their posts!
 * on WordPress:
 * https://snarfed.org/2004-03-09_britney_spears_concert#comment-39
 * https://snarfed.org/2015-12-07_bridgy-stats-update#comment-2596759
 * on Redwind:
 * http://kylewm.com/2014/11/courtarro-i-was-more-going-for-the-meaningless-comparisons
 * http://kylewm.com/2015/06/that-thing-where-you-re-lecturing-family-members

Multi-photo comment examples

 * supports showing comments with multiple photos! E.g.
 * https://aaronparecki.com/2019/01/11/28/ has a multi-photo reply, originally posted on Twitter, backfed by Bridgy, and with the photos displayed in a 2x2 photo grid under the comment

Bridgy
Bridgy supports backfeeding Facebook photo comments (#646) and Twitter photo @-replies.

Silo Examples
Silos that support photo comments.

Facebook
Facebook supports photo comments, e.g. (permalink needed)

Twitter
Twitter supports photo @-replies, that is, @-replies with a photo attached, e.g. Twitter also supports multi-photo reply posts, that is replying with multiple photos (up to 4), e.g.
 * https://twitter.com/schnarfed/status/532281408958775297
 * https://twitter.com/RonaldVermeij/status/1084159846797246465 on this POSSE tweet