Let's see if Masto can show pictures via links:
Here's the direct link to the pict:
https://merritt.cdlib.org/d/ark%3A%2F28722%2Fk2h99309c/0/producer%2Fartiraq.org%2Fstatic%2Fopencontext%2Fpoggio-civitate%2Fpreview%2F19840105.jpg
And here's the Web page for it: https://opencontext.org/media/FEDA00BF-FAFE-48F6-C6C8-28B5B671BA08
It's a terracotta modeled cat, an architectural decoration from an early Etruscan building.
Hmm... source code seems to say yes, #Mastodon should support Open Graph tags, see: https://github.com/tootsuite/mastodon/blob/f0de621e76b5a5ba3f7e67bd88c0183aac22b985/db/migrate/20170119214911_create_preview_cards.rb
Bummer. I wish #Mastodon could use the Open Graph metadata that Twitter and Facebook uses. It would make shared links more lively in this platform.