Interested in thoughts on my postflop play here, and what you would do on the river.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) from (Format: FlopTurnRiver)

Hero ($49.10)
CO ($51.60)
Button ($70.70)
SB ($49.50)
BB ($30.35)
UTG ($44.90)

Preflop: Hero is MP with 6, 4.
1 fold, Hero calls $0.50, 1 fold, Button calls $0.50, 1 fold, BB checks.

Flop: ($1.75) 4, 3, K (3 players)
BB checks, Hero bets $1.5, Button calls $1.50, BB folds.

Turn: ($4.75) 4 (2 players)
Hero bets $3, Button calls $3.

River: ($10.75) Q (2 players)
Hero bets $7, Button raises to $25, Hero ???

Interested in preflop analysis too? UGH! Either fold or raise please, open limping = VERY bad.

Reads? Can villian have KQ here? If not, that's an interesting raise...it's either a pure bluff, or he has something like KT/KJs and hit the flush. Hard to say, in a vacuum I swear and fold.

River is a fold-and-swear imo.