My 2nd hand at the table, villain is complete unknown.

Cereus Network - $0.50 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 3

Hero (SB): $50.00
BB: $30.00
UTG: $52.25
CO: $100.50
BTN: $57.05

Hero posts SB $0.25, BB posts BB $0.50

Pre Flop: ($0.75) Hero has A K

fold, fold, BTN raises to $1.50, Hero raises to $5.00, fold, BTN calls $3.50

Flop: ($10.50, 2 players) 7 5 7
Hero checks, BTN checks

Turn: ($10.50, 2 players) K
Hero bets $7.25, BTN calls $7.25

River: ($25.00, 2 players) 6
Hero bets $13.50, BTN raises to $44.80, Hero ???

1- with our clean image is it better to just bet flop?

2- I think my turnsizing sucks, PSBtwice to get AI by the river to get max value from his KQ and KJ hands may be better?

3- as played call his jam? awesome odds but he's prolly never bluffing...

ty guys.