Party Poker No-Limit Hold'em, $ BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($39.66)
Hero ($25.25)
BB ($26.80)
UTG ($26.50)

Preflop: Hero is SB with Q, Q. Hero posts a blind of $0.10.
1 fold, Button calls $0.25, Hero (poster) raises to $1.1, 1 fold, Button calls $0.95.

Flop: ($2.65) J, 5, 2 (2 players)
Hero bets $2, Button calls $2.

Turn: ($6.65) 4 (2 players)
Hero bets $4, Button calls $4.

River: ($14.65) T (2 players)
Hero bets $6, Button calls $6.

Final Pot: $26.65

River bet too small? What would be more appropriate? ~$10?