Well, as I say, it's hard to read a monkey's expression - and I may indeed be projecting an emotion onto that of Gheeraerts's. I'm more interested in the intense focus of Landseer's though, and its obliviousness of the cat and its experience, and was using the Gheeraerts primarily to draw attention to that.

If you look closely you'll see that the monkey's own paw is perfectly safe - though it's certainly having to concetrate to keep it so.