You never slowed down so it's almost impossible to tell if Villan is slow-playing or just letting you put money into a pot he feels confident he can win and not wanting to scare you off. Though the Turn bet is a default All-in for Arkie5 if he calls so I think that last 6 was going in on the river if you bet it or not.

On the flop any A could call that bet, also I see 33, AK, AQ, and JT calling that bet.

By leading the turn hard you take away any way of knowing if you are ahead or behind. With two callers, I maybe make a smaller bet and see if I get played back at. But with a high two-pair I'm not sure I don't press hard here either. You have to take AK and AQ into account here though. They both have you beat and are more than capable of just calling your pre-flop and flop bets.

The River is a no-brainer. as I said earlier his 6 was going in no matter what here.