Original pic parameters say:
date:modify: 2018-10-08T18:49:21+00:00
which would be 13:49:21 (EST)
Q used it in the post 14:05:15(EST)
So sometime in these 16 mins Q grabbed it from there and re-posted it on /PF/.
But haven't found the orig tweet either, except that twitter filenames of images posted at nearby times tend to have similar filenames, as the tweet roughly an hour after Q:
twitter.com/Mark923to25/status/1049377308702887936/photo/1
pbs.twimg.com/media/DpAjF8kVsAUv9J8.jpg