These look really good! I think the Cera drawing is my favorite, the color scheme makes me think of the earlier LBT sequels.
The only nitpick I'm going to point out is the way Petrie's wings are drawn looks a little odd. I know wings can be hard to draw from certain angles, though. Maybe looking at a movie screenshot could help next time. Other than that, however, I think you've done a great job on your art!
Nice to see some characters in the group picture that people don't draw very often, too.
P.S.--I would suggest that instead of starting a new topic for each batch of fanart you post, you put it in a reply to your original fanart topic, instead. That way, it can all be seen in one place.
