Bad Turn Bluff Raise?

[Redeye]

Villian seems like a decent TAG. 22/18/2 type numbers. After the flop iso, I was preparing to fold to further turn aggression. However, I thought the Q gave me the perfect card to bluff 3-bet since it looks like I iso-raised a Q on the flop. This is something I do not normally do, was this bad? Was it really a turn 3-bet or did I likely have the best hand?

PokerStars 5/10 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#CC3333">MP raises</font>, <font color="#666666">3 folds</font>, Hero calls, UTG calls.

Flop: (6.40 SB) Q[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG checks, <font color="#CC3333">MP bets</font>, <font color="#CC3333">Hero raises</font>, UTG folds, MP calls.

Turn: (5.20 BB) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP raises</font>, <font color="#CC3333">Hero 3-bets</font>