Should I have raised earlier?

PokerStars 0.25/0.50 Hold'em (7 handed) pokerhand.org hand converter

Preflop: Hero is SB with T[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG calls, MP1 calls, MP2 calls, CO calls, <font color="#666666">1 fold</font>, Hero completes, BB checks.

Flop: (6 SB) A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(6 players)</font>
Hero checks, BB checks, UTG checks, MP1 checks, <font color="#CC3333">MP2 bets</font>, CO calls, Hero calls, BB folds, UTG calls, MP1 calls.

Turn: (5.50 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
Hero checks, UTG checks, MP1 checks, <font color="#CC3333">MP2 bets</font>, CO calls, Hero calls, UTG folds, MP1 calls.

River: (9.50 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP1 calls, MP2 calls, CO calls.

Final Pot: 21.50 BB