Preflop
Standard isolation spot of course. You could go a little larger, especially when you have the second best starting hand in NLH. He limped into the pot, and he wants to give you value, so why not let him. Or let someone else put in more money preflop with a worse hand.
Flop
Standard C-bet of course. Here I really prefer a larger bet for value. You are playing against a fish at 2NL, and you dont need to give him such a great price to get him to make a bad call with his whatever. A larger bet on the flop sets it up for larger bets on the turn and river on clean runouts. This kind of bet sizing, which you use, is for tournaments or high stakes cash games not for playing against a fish at 2NL.
Turn
This is a very bad card for you, because top pair is a significant part of his range, so your hand is almost like second pair now, and it has become a 2 street hand rather than a 3 street hand. I prefer to check back and then either call any reasonable river bet or bet around half pot for value on the river, if he check to you.
River
As played check back. The issue with betting so small is, you turn your hand completely face up, and even a fish might be able to figure that out. You would never use this sizing with trips or better, and you would never use this sizing with a bluff either. You always have a marginal made hand like a pocket pair, and this give Villain a green light to go ahead and raise for value with any trips or better or bluff you. As played you have to fold. There are no busted draws (54 got there), and basically you hand is simply not strong enough to play for stacks.
__________________
|