NL10: TT heads-up commitment decision

[coinflip]

Background: Been pretty cold-decked at this table. VPIP around 10 or so, and the big cards I've been raising preflop have largely missed postflop, and I've either been c/f UI multiway or folding after a cbet getting raised postflop. My table image is probably kind of nitty at this point.

PokerStars No-Limit Hold'em, $0.10 BB (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($9.85)
UTG+1 ($7.15)
MP1 ($9.95)
MP2 ($9.75)
CO ($10.70)
Button ($10.20)
SB ($3.90)
Hero ($7.05)

Preflop: Hero is BB with T[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls $0.10, <font color="#666666">3 folds</font>, SB completes, <font color="#CC3333">Hero raises to $0.5</font>, MP1 calls $0.40, SB folds.

Flop: ($1.10) J[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.8</font>, MP1 calls $0.80.

Turn: ($2.70) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets $1.2</font>, Hero calls $1.20.

River: ($5.10) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets $4</font>, Hero ...

After my flop bet gets called, I check for pot control, but I wonder given the potential straight draw out if I should have bet. When villain bets, I figure given my image he could be betting a variety of hands worse than top pair and call.

River is a blank and MP1 essentially puts me all-in for around a PSB. In retrospect, leaving myself a PSB behind seems to be what set up this tough river decision. Did calling this turn commit me to calling the river? And if so, should I just have pushed the turn?