NL50 KQo did i fire too much?

[sakrei]

Stats 31.3/13.9/2.7, has never check raised. I am a noob at bluffing, trying to learn.
Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 9 Players
LeggoPoker.com - Hand History Converter

SB: $44
BB: $116
UTG: $70.90
UTG+1: $51
UTG+2: $54.95
Hero (MP1): $70.25
MP2: $29.35
CO: $30.40
BTN: $17.10

Pre-Flop: Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] dealt to Hero (MP1)
3 folds, <font color="red">Hero raises to $2</font>, 3 folds, SB calls $1.75, BB folds

Flop: ($4.50) 8[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $3.50</font>, SB calls $3.50

Turn: ($11.50) 9[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $7.50</font>, SB calls $7.50

River: ($26.50) 6[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $15</font>, SB folds

Results: $26.50 Pot ($1.25 Rake)
Hero mucked Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] and WON $25.25 (+$12.25 NET)