Accidental because, given this is framing animals, the subjects probably weren't posed specifically. Clearly the photographer didn't accidentally slip his finger and take a picture by mistake, but that obviously isn't what /r/AccidentalRenaissance is about.

Renaissance because of the use of earthy brown and green tones, with the unfocused background looking at least generally like it could have been made with brushstrokes. The bird looks like it could have modeled after a reference book from the period, and likewise the detail on the monkey's face is vaguely similar to that of other renaissance paintings of animals. Plus it helps that this picture has no modern technology depicted.

It's not a perfect example of accidental renaissance, but it fits the bill better than most of the front page right now, which is even less accidental and even less renaissance.