Villain is about 15/10ish so far though small sample.
He's also playing multiple tables.

River looked great to bluff, so I went for it. Thoughts?

PokerStars No-Limit Hold'em, $0.25 BB (7 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (SB) ($25.10)
BB ($26.40)
UTG ($5)
MP1 ($55.30)
MP2 ($25)
CO ($8.20)
Button ($15)

Preflop: Hero is SB with K, Q
5 folds, Hero bets $1, BB calls $0.75

Flop: ($2) 3, 7, 5 (2 players)
Hero bets $1.50, BB calls $1.50

Turn: ($5) 7 (2 players)
Hero bets $3, BB calls $3

River: ($11) A (2 players)
Hero bets $6