Did I dig myself into a hole with this bluff?

[Kandahar]

PokerStars Tournament, Big Blind is t50 (4 handed) Converter on pregopoker.com

CO (t7905)
Button (t875)
SB (t3430)
Hero (t1290)

Preflop: Hero is in BB with Q[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img]
CO calls t50, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, Hero checks

Flop: (t125) 4[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/spade.gif[/img] (2 players)
<font color="red">Hero bets t75</font>, CO calls t75

Turn: (t275) 9[img]/images/graemlins/club.gif[/img] (2 players)
<font color="red">Hero bets t150</font>, CO calls t150

River: (t575) Q[img]/images/graemlins/diamond.gif[/img] (2 players)
<font color="red">Hero bets t400</font>, <font color="red">CO raises to t1000</font>,

Hero: ???

I'm sure I badly misplayed this hand, but I'm not sure where. My table image is very tight, and I haven't bluffed at all during this SNG.

Should I have not fired again on the turn, after he called me on the flop? Should I have bet on the river (when I had something), after betting the flop/turn (when I didn't have anything)? Is this an easy fold after his all-in? It's an $11 SNG.