Several things stand out in this photo. First, I hope the model knew that monkeys can
grab and yank on things with their feet. (I discovered this myself in a Mexican open air
market in 1973, but fortunately I had my pants on at the time.) Second, the monkey
at right looks quite depressed. Third, that may be because both the monkeys
appear to be on leashes and/or chains. Kinda sad, actually. No PETA back then.
Edited to add: This is also Kenneth Shreves according to James IV in the comments.