Small flush draw from BB in unraised pot

[Jacques]

Online No-Limit Hold'em, $20 BB (9 handed) FTR converter on zerodivide.cx

Villain is 20/6 and goes to showdown 18% after seeing the flop.

Hero ($1980)
BB ($4520.50)
UTG ($2266)
UTG+1 ($2954.50)
Villain ($2967)
MP2 ($1848)
MP3 ($2067)
CO ($1870)
Button ($1910)

Preflop: Hero is SB with 6[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img]. Hero posts a blind of $10.
2 folds, Villain calls $20, 2 folds, CO calls $20, 1 fold, Hero (poster) completes, BB checks.

Flop: ($80) 3[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] (4 players)
Hero checks, BB checks, Villain bets $70</font>, CO folds, Hero raises to $280</font>, BB folds, Villain calls $210.

I would often bet the pot on the flop but tried something else this time.

Turn: ($640) 8[img]/images/graemlins/diamond.gif[/img] (2 players)Hero bets $500, Villain calls $500.

River: ($1640) K[img]/images/graemlins/club.gif[/img] (2 players)

Comments on all streets appreciated.