Misplayed Turned Flush?

[RickOSU]

Is this standard given an unknown opponent?
This is from the $475 buyin Barcelona sat. on Stars.
Thanks.

Poker Stars
No Limit Holdem Tournament
Blinds: t15/t30
9 players
Converter

Stack sizes:
UTG: t3220
UTG+1: t3930
MP1: t1335
MP2: t2620
MP3: t895
CO: t3800
Button: t2170
SB: t5380
Hero: t3340

Pre-flop: (9 players) Hero is BB with 3[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img]
UTG calls t30 <font color="aaaaaa">(pot was t45)</font>, UTG+1 calls t30 <font color="aaaaaa">(pot was t75)</font>, 6 folds, 6 folds, Hero checks.

Flop: A[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/heart.gif[/img] (t105, 3 players)
<font color="#cc0000">Hero bets t60</font>, UTG calls t60 <font color="aaaaaa">(pot was t165)</font>, UTG+1 calls t60 <font color="aaaaaa">(pot was t225)</font>.

Turn: 9[img]/images/graemlins/heart.gif[/img] (t285, 3 players)
<font color="#cc0000">Hero bets t150</font>, <font color="#cc0000">UTG raises to t600</font>, UTG+1 folds, Hero calls t450 <font color="aaaaaa">(pot was t1035)</font>.

River: 3[img]/images/graemlins/spade.gif[/img] (t1485, 2 players)
Hero checks, <font color="#cc0000">UTG bets t510</font>, Hero calls t510 <font color="aaaaaa">(pot was t1995)</font>.

Results:
Final pot: t2505