PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($71.60)
SB ($59.10)
Hero ($45.05)
UTG ($21.05)
UTG+1 ($77.75)
MP1 ($15.70)
MP2 ($71.75)
CO ($49.45)

Preflop: Hero is BB with K, 4.
4 folds, CO calls $0.50, 1 fold, SB completes, Hero checks.

Flop: ($1.50) 6, 8, 7 (3 players)
SB bets $1.5, Hero calls $1.50, CO folds.

Turn: ($4.50) 5 (2 players)
SB bets $2, Hero calls $2.

River: ($8.50) A (2 players)
SB bets $2, Hero calls $2.

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Opponent is a 32/21 over 90 hands.

Is my line fine?