Turned Straight on Flush Board

[samsonite2100]

PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($48.70)
UTG ($35.90)
UTG+1 ($55.35)
MP1 ($19.95)
MP2 ($12.80)
CO ($47.75)
Button ($73.80)
SB ($50.45)

Preflop: Hero is BB with J, 2.
UTG calls $0.50, 5 folds, SB completes, Hero checks.

Flop: ($1.50) Q, 9, T (3 players)
SB bets $1.5, Hero calls $1.50, UTG folds.

Turn: ($4.50) K (2 players)
SB bets $3, Hero raises to $8.5, SB calls $5.50.

River: ($21.50) 8 (2 players)
SB checks, Hero checks.

Final Pot: $21.50

Curious what you think of my line, mainly checking behind on river. Not sure if I left $ on the board here--I often see weak flushes checking in this spot.

[Renton]

Just fold the flop. You have 6 dirty outs, and will have a hard time getting paid off if you hit, meaning you aren't getting implied odds or pot odds to call a pot size bet, even if it is only 1.5.

As played I'd bet like 8 on the river for value.