FT NL25 TP2K faces unhappy river oop

[Shaffer]

Fairly basic question, I'm just beginning to get back into FRNL for real. Smells to me like I'm misplaying in these situations, wanting to fix leaks.

Mostly concerned about the river line but comments on all streets are welcome.

Villain is 49/15/1.1 over 50 or so hands.

Full Tilt Poker No-Limit Hold'em, $0.25 BB (9 handed) Hand History converter Courtesy of PokerZion.com

saw flop

CO ($25)
Button ($31.80)
SB ($20.10)
BB ($21.40)
UTG ($40.25)
UTG+1 ($22.55)
MP1 ($37.15)
MP2 ($10.70)
Hero ($22.10)

Preflop: Hero is MP3 with K[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.25.
UTG calls $0.25, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $1</font>, CO (poster) calls $0.75, <font color="#666666">3 folds</font>, UTG calls $0.75.

Flop: ($3.35) 3[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets $2.25</font>, CO calls $2.25, UTG folds.

Turn: ($7.85) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4</font>, CO calls $4.

River: ($15.85) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ?