PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($16.95)
Hero ($30.15)
BB ($30.25)
UTG ($25)
MP ($24.90)

Preflop: Hero is SB with A, K. UTG posts a blind of $0.25.
UTG (poster) checks, MP raises to $0.75, 1 fold, Hero raises to $3, 1 fold, UTG folds, MP calls $2.25.

Flop: ($6.50) 7, 6, 8 (2 players)
Hero checks, MP checks.

Turn: ($6.50) 8 (2 players)
Hero checks, MP bets $4, Hero raises to $10.25, MP calls $6.25.

River: ($27) 9 (2 players)
Hero bets $16.9 (All-In), MP ....

Final Pot: $55.55

Is this a good spot to bluff since i sense weakness. If this is a good spot to bluff how should it be done?