The Opps who are still in on the turn are unknowns. Please comment on my play

PokerStars No-Limit Hold'em, $0.10 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($2)
UTG ($10.95)
UTG+1 ($3)
MP1 ($10.65)
MP2 ($4.35)
MP3 ($8.75)
CO ($9.20)
Button ($14.50)
Hero ($9.35)

Preflop: Hero is SB with 4, K. UTG+1 posts a blind of $0.10.
UTG calls $0.10, UTG+1 (poster) checks, 1 fold, MP2 calls $0.10, MP3 calls $0.10, CO calls $0.10, 1 fold, Hero completes, BB checks.

Flop: ($0.70) 4, 9, K (7 players)
Hero bets $1, BB folds, UTG folds, UTG+1 folds, MP2 calls $1, MP3 folds, CO calls $1.

Turn: ($3.70) 7 (3 players)
Hero bets $2.5, MP2 raises to $3.25, CO folds, Hero calls $0.75.

River: ($10.20) T (2 players)

Final Pot: $10.20