Changing from Value betting to bluffing mid hand

[MooreMoney19]

I dont have any read on villian other than he appears to be a little timid when it comes to calling large bets. I usually would just check behind on the turn but i didnt want some stupid A3 36 or 32 to catch up. Villian almost snap called on the turn making me believe that A. He didnt have a 5 and B. He probobly had a pair above the board.
Who would check behind on the river hoping to beat some kind of weak 2 pair and who bets to represent an AK AQ type hand? Also putting yourself in villians shoes, what hands can he call with here?
SB: $195.00
BB: $218.05
UTG: $272.70
villian (CO): $210.50
Hero (BTN): $178.25

Preflop: Hero is dealt 7[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG folds, villian calls $2.00, <font color="red">Hero raises to $9.00</font>, 2 folds, villian calls $7.00

Flop: ($21) 3[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/heart.gif[/img] (2 Players)
villian checks, <font color="red">Hero bets $14.00</font>, villian calls $14.00

Turn: ($49) 2[img]/images/graemlins/heart.gif[/img] (2 Players)
villian checks, <font color="red">Hero bets $33.00</font>, villian calls $33.00

River: ($115) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
villian checks, <font color="red">Hero bets all-in for $122.25</font>

[kura0]

its interesting,
i dont think he will call without an A or a 6 obv, your risking about 120 to win 115, he must fold more than 50 percent here to make your play even,
given preflop his range contains some aces and some pockets , as well as a slowplayed 5 . i dont think hes folding too much of those here often enough.