As he only made three movies and there are few if any recordings of his stage and prolific TV work, it is impossible to measure his versatility as an actor now.
He was undoubtedly a very attractive guy. No "nude in a tree" photo in my copies of "Hollywood Babylon (I and II) so Anger has either removed it because it was a fake or it was never there in the first place
I have seen the pic and it is too blurred to be sure who it is.
Here are a few shirtless pics of Jimmy from my collection: