[Closed] NL5- AK, bet size doubt

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$0.02/$0.05 No-Limit Hold'em (6 handed)

Known players:
[tg]BU$15.46:///////;SB$7.95:///////;BB$4.54:///////;MP2$5.00:///////;MP3$4.47:///////;CO(Hero)$5.00:///////;[/tg]

Preflop: Hero is CO with K:h, A:s.
MP2 folds, MP3 raises to $0.20, Hero raises to $0.60, BU folds, SB calls $0.58, BB folds, MP3 calls $0.40.

Flop: ($1.85) A:h, A:c, J:c (3 players)
SB bets $0.05, MP3 calls $0.05, Hero raises to $1.20, SB calls $1.15, MP3 folds.

Turn: ($4.3) 4:d (2 players)
SB bets $0.05, Hero raises to $3.20(All-In), SB folds, Hero gets uncalled bet back.

Final Pot: $4.35.

would like to know if 2/3 of the pot is ok, or there's some situation that 3/4 is better?

then, i also would like to know when shall we push. Take as example the river of this hand.

thanks, and sorry for the bad english.