Boats Leaving

[jhuang999]

And here are two shots from the end of the night as the boats made their way back. There was a police helicopter in the sky that turned out like a UFO dragon or snake.

Constructive criticism is appreciated on all the photos to improve my skills. Also, I only had a UV filter. I know that Marko has said that a polarizer is pretty much always a good idea. Any comments on how that would have affected or improved the photos? Also what kind should I get? I have a T2i with a sigma 18-50 F2.8 lens. Hoya UV filter.

Thanks in advance,
Justin