The problem was that the guys on my table would probably not have folded to a $15 raise. They were calling stations and would sometimes do very unpredictable things like limping in with AA or KK. I would've had to have raised to at least $20+ if I wanted some folds, of which case I would've been pot-committed and could've lost to a higher pair or a broadway combination that hits on the flop.
As for the image, surely you understand what I mean. I'm not trying to sound shallow, but sometimes you look at a poker player and they just don't give off an intelligent vibe. I mean, poker is all about making generalisations about your opponents, stereotyping them and categorising them to give yourself the best advantage. That's what reading your opponents is all about, and this was my read of him.
It was hard to put someone on a JK or a J8. A J8 would've meant calling with a gut shot and a JK would've meant an open-ender. I thought that it would be definitely possible that someone had that, although it was also possible that they didn't and there was so much value to be won that I thought the pot odds
would be in my favour. I was planning to check/fold the river if the 9 didn't come up.