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Preflop: Hero is SB with A, K. Hero posts a blind of $0.10.
7 folds, Hero (poster) raises to $0.65, BB calls $0.50.

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Make a real raise.

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Flop: ($1.50) K, 4, 7 (2 players)
Hero bets $0.5, BB raises to $4, Hero raises to $15, BB calls $11.75 (All-In), Hero calls $0.75.

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Make a real bet. Unless you have a read and know this guy will bluff raise a weak looking bet, such a small bet is silly.

Becuase you made such a small raise you not only failed to define your own hand, you have made it difficult to define your opponents hand. For this very reason, the whole hand is going to be difficult to play.

I am not sure about the reraise on the flop. I am uncomfortable putting so many BBs in the pot with out a solid read against someone that is raising the original "aggressor".