Hand #1:
Not bad. I can't beleive the queens didn't pay you off! 50c was probably too cheap on the turn, I like to bet $1 minimum unless I'm playing a mind game with someone heads up. Maybe you could have thrown out a pot sized bet on the river to look like you're buying out the pot and see if you can catch someone playing traffic cop? Any read on the players? Passive call-stations?

Hand #2
I'm thinking bigger raise on the turn, ~$3 at least. The weak bet just reeks of someone drawing that doesn't want to be bet into. If he's drawing, no way he's going to pay you off on the river.

Hand #3
Either limp in with Jacks or raise it up bigger pre-flop. Raising to only $1 did almost nothing for you. Should have gone with $2-$3. If you take it down pre-flop it's not a bad take for a pair of Jacks.