NL100 Queens and difficult River decision

[ComputerMaster]

Were not sure about river decision... . Did I left their some value not pushing river? had some fear from a made flush:

No-Limit Hold'em, $1 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($112.20)
UTG ($102.50)
Hero ($105.10)
CO ($98.40)
Button ($96.33)
SB ($44.80)

Preflop: Hero is MP with Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $3.5</font>, <font color="#CC3333">Hero raises to $12</font>, <font color="#666666">4 folds</font>, UTG calls $8.50.

Flop: ($25.50) 3[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $17.5</font>, UTG calls $17.50.

Turn: ($60.50) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.

River: ($60.50) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $33.5</font>, Hero calls $33.50.

Final Pot: $127.50