Taken on a 1956 visit to New York, it's a more dynamic pose than was used for Bob's 1957 Topps (which is from the same photoshoot), but it's not too great for a facepack upgrade, what with a small head, partially in shadow.
Still, the current facepack pic of Bob is black & white, so an upgrade's an upgrade, I say.
Keegan, btw, is probably the second-best pitcher ever to attend Bucknell. Just
slightly behind Christy Mathewson.