I know what you mean about the blue hue in the second shot (or is it pink?), I’m just to lazy to get around to re-doing the white balance on it! I don’t see what you mean about something funny going on in the sky, unless it’s the spray jumping up that you are seeing?
The star shot is shown as it was on the night. I didnt add any extrea stars or anything like that. The only thing I did to the stars was to clone out a small flare on the middle LHS. Other than that that’s just the way there were showing in the sky..