I agree a picture is a great thing to have, I also, have 40+ deer heads mounted for teh same reason, to remind me of hunts, NOT all are what some would consider a trophy, but they are to me

next there used to be a company that sold wooden Plaques for mounting antlers on, that had a cut out for a photo, back when I had my gun shop I bought about a 100 of them and took them to my hunting camop and for me at my places!

and found them great to keep a photo attached to a set of antlers
they were something like this,

https://www.walnuthollowcountry.com/...h-photo-frame/

but the photo section was recessed into things,

something else I have done too, on big game animals, is, I would also, add the empty casing for the plaque near the photo to also remind me what what weapon I used
on Archery kills i would normally add the whole arrow to the antlers, or sometimes just the broadhead
I would also, write on back of of the plaques a short description of the hunt, date time of kill, location, weather or other info!
I also always tried to save tags and keep attached to antlers as well!

I would imagine these plaques would be pretty easy to make if anyone wanted to, if they have basic wood working skills!

I can take some pictures of mine, and how there designed,
if asked!