River bluff with low pocket pair

[1fineday]

CO is 28/15/1.25 on 80 hands. Went to SD 5.88
Give your comments plz

Party Poker, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

BB: $24
UTG: $36.62
MP: $54.82
CO: $24.65
BTN: $54.04
Hero (SB): $55.40

Pre-Flop: 5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] dealt to Hero (SB)
UTG folds, <font color="red">MP raises to $0.75</font>, <font color="red">CO raises to $2.50</font>, BTN folds, Hero calls $2.40, 2 folds

Flop: ($6) J[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $3.50</font>, Hero calls $3.50

Turn: ($13) 3[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, CO checks

River: ($13) 2[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $6</font>