1st hand is good, you could have called the 3-bet but I like the cap and would have done the same since you have so much equity. Turn is good, semi-bluffing here would do no good and the river is fine, a bluff there would have been a bad play against 3 other players.

Nicely played

2nd hand, you played it well you weren't going to shake the other player though, he had top pair and a gut-shot on the flop and drew to 2-pair on the turn. The river it looks like he probably hit trip aces or had a king and was being fancy as Trons said. At this level I would never fold your Queens full, and at higher levels it is more player dependant, you will get called and raised by worse hands so you can liberally raise for value. You aren't going to run into alot of good players at .25/.5 so unless this guy is a major mouse you played it right.

Nicely played