Bet the river after two smooth calls?

Villain here has only played a few hands at this point. Has not gone to showdown. I'd say weak/tight but hard to know without seeing some hole cards.

Table as a whole was tight except for one person who folded prior to my raise. I raise preflop here because I haven't played many hands and my table image(if it matters to these guys) is tight but I've not showdown a hand and only seen a couple flops up to this point. With the one loose player folding in front of me I figure I can make an easier stab at this pot so I raise with my marginal hand. I'd fold quickly to a preflop reraise here.

Game #1454294483: Hold'em NL ($0.15/$0.25) - 2005/11/29 - 20:21:47 (ET)
Table "Saga" Seat 7 is the button.
Seat 1: CueBall66 sits out
Seat 2: Rikint ($8.95 in chips)
Seat 3: lara777 ($17.75 in chips)
Seat 4: andrewd sits out
Seat 5: Hero ($48.45 in chips)
Seat 6: Saine64 ($5.73 in chips)
Seat 7: asjemenou ($27.70 in chips)
Seat 8: Winnit002 ($10 in chips)
Seat 9: catkins69 ($23.10 in chips)
Seat 10: Tizwozere ($44.34 in chips)
catkins69: posts small blind $0.15
Tizwozere: posts big blind $0.25
----- HOLE CARDS -----
dealt to Hero [Q [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/club.gif[/img]]
Rikint: calls $0.25
lara777: folds
Hero: raises to $0.75
Saine64: folds
asjemenou: folds
catkins69: calls $0.60
Tizwozere: folds
Rikint: calls $0.50
----- FLOP ----- [Q [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/heart.gif[/img] 8 [img]/images/graemlins/club.gif[/img] ]
catkins69: checks
Rikint: checks
Hero: bets $2
catkins69: calls $2
Rikint: folds
----- TURN ----- [9 [img]/images/graemlins/heart.gif[/img] ]
catkins69: checks
Hero: bets $3
catkins69: calls $3
----- RIVER ----- [7 [img]/images/graemlins/club.gif[/img] ]
catkins69: checks
Hero ??

Do I fire a third time?