Yeah, I agree that busts are fun to draw. xD It allows the artist to focus more on the facial details, expressions, and other stuff. They are simple, but very effective. You did an excellent job on these! It's always a pleasure to see more of your characters, and I really am liking how expressive and lively your expressions are. You've gotten a lot better at executing expressions.
Hehehehehe, I love Cory's expression a lot. xD Love his puppy eyes at being saddened over being dumped. I really love Karl's upset expression a lot. I know that he's usually stoic and appears to be emotionless and apathetic, but he is a caring person deep down. He puts on this front as some barrier, but I like that it affects him when he sees Amilia cry. He cares for her a lot, even if he has trouble displaying it. Okay, Krissie's expression at staring at Sammi's bum made me snicker. xD It's just so funny and well done. Jason having a nice morning chat with his mother. xD Brilliant. He and I are not morning people. xD
The line art, colouring, and attention to details are up to your usual standards! I do like that your colouring and pieces in general are looking more fluid and dynamic. Excellent composition! I love these a lot.