Value-raising on Turn and River

[gryphon_gold]

Fourth hand of the session, no reads.

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PokerStars 0.50/1.00 Hold'em (7 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is Button with 7[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
UTG calls, MP1 calls, MP2 calls, CO calls, <font color="#CC3333">Hero raises</font>, SB calls, <font color="#666666">1 fold</font>, UTG calls, MP1 calls, MP2 calls, CO calls.

Flop: (13 SB) J[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, UTG checks, MP1 checks, MP2 checks, CO checks, Hero checks.

Turn: (6.50 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, UTG checks, <font color="#CC3333">MP1 bets</font>, MP2 folds, CO calls, Hero calls, SB calls, UTG folds.

River: (10.50 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, MP1 checks, <font color="#CC3333">CO bets</font>, Hero calls...

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On the turn, I was hoping to collect more money on the river. However, I wonder if it was worth the risk of slowplaying with three high cards to a straight already on the board.

On the river, I thought a raise would scare away callers, possibly including the bettor. Though, I really have no idea what the best play here is.

Were these calls right?