25NL - Flop Flush, Bad River

[calmB4storm]

<font color="green">No reads on Villain, it's just my second orbit at the table.
Any thoughts on the river? Am I pot committed by the end? Would check/calling be a better line?</font>

Full Tilt Poker
No Limit Hold'em Cash Game
$0.10/$0.25 Blinds
6 Players - (LegoPoker HH Converter)

SB: $20.55
Hero (BB): $25.00
UTG: $28.40
MP: $30.70
CO: $15.65
BTN: $15.45

Preflop: Hero is dealt 8[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (6 Players)
2 folds, CO calls $0.25, BTN calls $0.25, SB calls $0.15, Hero checks

Flop: ($1) Q[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (4 Players)
SB checks, <font color="red">Hero bets $1.00</font>, CO folds, BTN calls $1.00, SB folds

Turn: ($3) K[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $2.00</font>, BTN calls $2.00

River: ($7) A[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $4.00</font>, <font color="red">BTN raises all-in to $12.20</font>, Hero ???

Pot Size: $31.40 ($1.55 Rake)