Is this photo shopped ? Arms looking Ronnies size
Good pick up - may very well be. I've compared the original (below) to the potentially photoshopped one and there isn't much difference, if any. All that I could notice was a tiny bit of biceps and lats size, with a tiny bit shaved off the waistline, but that could simply be a slight difference in composition, not necessarily meaning it's photoshopped.
Below the original is one more from the same shoot in 1977.