[Up-grey-de]

You should focus more on what he has, if it is a bluff I think it is a good line if villian is a weak / loose player. If he is tight i would avoid betting again as a bluff.

However if you have a hand, like overpair or a flushdraw I would def bet again, probably 17 or so. I would check a pair of 5´s, but bet any pair higher than that.