should I have fired another shot?

[makazeUK]

.25/.5 nl

Hero under the gub.
Villian is UTG+3 15/9/ I have played around 200 hands with him and can't find a similar hand. He has a high take down win ratio. Nearly always plays in position. I have been thinking he was gonna make a play on me.

Dealt HERO Q [img]/images/graemlins/spade.gif[/img] A [img]/images/graemlins/spade.gif[/img]
HERO : Raise $2.25

Villain: Call $2.25
sb: Call $2.00
bb: Call $1.75

*** FLOP *** Q [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img] 6 [img]/images/graemlins/club.gif[/img]
sb: Check
bb: Check
HERO: Bet $8.00
villain: Call $8.00
sb: Fold
bb: Fold

*** TURN *** 5 [img]/images/graemlins/club.gif[/img]

HERO: Check (should I have popped a bet in here, if so how much?)
villain: Bet $15.50
HERO: ?