[SharkSandwich]

Dirte, what you're saying first of all is you didn't call, so we won't ever know what he had? Is that right?

Secondly I think you're overestimating image. You can't count on it, and opponents to react on it, at this level. Many opponents aren't observant enough, are too busy playing lots of tables, or just don't care.

There's a lot of opponents who call your PF raise with an underpair, and call the expected flop continuation bet, like wise with a suited connector containing a Jack. Because they're happy to be ahead of AK. Which is what you have.

When the Turn hits he realises the hand he was ahead (AK) he is now behind. He's happy to check.

When the River hits and you still check his thoughts could well be "damn?! he got nothing?!". And there comes the bluff. It seems you've given up on the pot.

And to say "he'd bluff a bigger amount" is fine. Except you can't just fold to small bets because they aren't bluffs, and call big bets because they might be. That's saying you're not willing to put a bit in to win the pot, but you'll put a lot in.

You think he checks JJ/55/44 on the Turn? I don't. You're only behind QQ and QJ. He could have either. If he has neither you're good.