Man of 50 here, name changed as I post a lot on Secondary school threads, going through 11+ choices.
Anyway, saw this thread and made me think.
I know a few men my age that are newly single having divorced, one sadly wife passed away a while back and is trying to find a soulmate.
I can just imagine this guy struggling to find the words in reply to getting a pic sent, if not requested. Sounds like a typical thing a bloke my age would do, panic, not say anything, then leave it too late to comment for it to be weird.
Agree with many here, if he didn't think you looked nice enough to meet, he wouldn't make plans to meet, he'd either just wriggle out of meeting or just go radio silent.
My mates , those going back into the dating game, are pretty old fashioned
(born in the late 60's/early 70's , grew up in the 70's as boys, 80's as teens) crap at expressing ourselves really.
OP, I'm 100% sure he just tried to find the right words to not scare you off, left it too long and now can't comment on your pics because its weird.
I'd ask directly," did you get my pics? " gives him no excuse but to comment, I agree he's messed up here a bit, but he probably likes you, just a bit awkward and a bit of a pratt like all men my age!