$20NL River Spew with Flush draw

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Villain is 51/24/4 over about 60 hands, is shoving the river a spew? Should I be shoving on the flop or Turn, or check folding the river?

I think be doing this with a PP, or even be on a draw himself. surprisingly, given the stats he hasn't shown down any crazy hands, although he had his AT outkicked earlier, so I suppose he could just be running hot..

I suppose what I want to learn here is how to identify good spots to bluff on the river, when for example, as in this case, you may have missed a draw..

Prima Poker skin
No Limit Holdem Ring game
Blinds: $0.10/$0.20
10 players
Converter

Stack sizes:
UTG: $8.20
UTG+1: $21.54
UTG+2: $22.45
MP1: $2.60
MP2: $31.11
MP3: $10.50
CO: $19.80
Button: $57.47
Hero: $19.09
BB: $12.15

Pre-flop: (10 players) Hero is SB with A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img]
4 folds, MP2 calls, MP3, folds, CO (poster) checks, Button calls, Hero calls, <font color="#cc0000">BB raises to $0.4</font>, MP2 calls, CO calls, Button calls, Hero calls.

Flop: 5[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] ($2.8, 5 players)
<font color="#cc0000">Hero bets $1.5</font>, <font color="#cc0000">BB raises to $3</font>, 3 folds, Hero calls.

Turn: 3[img]/images/graemlins/club.gif[/img] ($8.8, 2 players)
Hero checks, <font color="#cc0000">BB bets $3.26</font>, Hero calls.

River: 9[img]/images/graemlins/diamond.gif[/img] ($15.32, 2 players)
<font color="#cc0000">Hero is all-in $12.33</font>, <font color="#cc0000">BB calls all-in $5.49</font>.
Uncalled bets: $6.84 returned to Hero.

Results:
Final pot: $26.3