flopping the nut flush

PokerStars Game #1970991285: Hold'em No Limit ($0.05/$0.10) - 2005/06/25 - 15:53:07 (ET)
Table 'Clivia' Seat #2 is the button
Seat 2: pokerknight2 ($8.20 in chips)
Seat 3: hemipwered05 ($4.35 in chips)
Seat 4: jazinc ($9.65 in chips)
Seat 5: SAMLUCK ($4.50 in chips)
Seat 6: motown bred ($4.05 in chips)
hemipwered05: posts small blind $0.05
jazinc: posts big blind $0.10
motown bred: posts big blind $0.10
*** HOLE CARDS ***
Dealt to hemipwered05 [Kh 5h]
pokerknight2 said, "dam king"
SAMLUCK: folds
motown bred: checks
pokerknight2: calls $0.10
hemipwered05: calls $0.05
jazinc: checks
*** FLOP *** [Th 9h Ah]
hemipwered05: checks
jazinc: checks
motown bred: checks
pokerknight2: checks
*** TURN *** [Th 9h Ah] [Ks]
hemipwered05: checks
jazinc: checks
motown bred: checks
pokerknight2: checks
*** RIVER *** [Th 9h Ah Ks] [7s]
hemipwered05: bets $0.50
jazinc: raises $0.50 to $1
motown bred: folds
pokerknight2: folds
hemipwered05: raises $0.90 to $1.90
jazinc: calls $0.90
*** SHOW DOWN ***
hemipwered05: shows [Kh 5h] (a flush, Ace high)
jazinc: mucks hand
hemipwered05 collected $4 from pot
jazinc said, "nice"
*** SUMMARY ***
Total pot $4.20 | Rake $0.20
Board [Th 9h Ah Ks 7s]
Seat 2: pokerknight2 (button) folded on the River
Seat 3: hemipwered05 (small blind) showed [Kh 5h] and won ($4) with a flush, Ace high
Seat 4: jazinc (big blind) mucked [Kc Qc]
Seat 5: SAMLUCK folded before Flop (didn't bet)
Seat 6: motown bred folded on the River

how could i have gotten more out of this..raise harder after river, bet on turn..?