Missed value, how much?

Villain is a complete unknown. after the flop, i figured just to call down. obviously i missed some value....
looking back i should have c/r turn?
sorry if this is really basic, just unsure of how to proceed in this situation in full ring. thanks in advance.


PokerStars No-Limit Hold'em, $2 BB (9 handed) converter

SB ($238)
Hero ($198)
UTG ($356.40)
UTG+1 ($223)
MP1 ($117.40)
MP2 ($200)
MP3 ($216.35)
CO ($218.10)
Button ($129.80)

Preflop: Hero is BB with T[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls $2, <font color="#666666">3 folds</font>, Button calls $2, SB completes, Hero checks.

Flop: ($8) 5[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets $6</font>, <font color="#CC3333">MP1 raises to $12</font>, Button folds, SB folds, Hero calls $6.

Turn: ($32) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets $8</font>, Hero calls $8.

River: ($48) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets $12</font>, Hero calls $12.

Final Pot: $72