Okay this one here is very neat and shows a good small animation. I think the use of color was an odd choice, very old-style browns and darker tones. The girl beside the tank is very cute and looks like she is thinking about something. I wonder what...but the tank intself has great details and textures and is good pixel art. I just wish this had more color going on, but that might be your point for future projects.
~~THINGS TO IMPROVE ON~~
Just add a bit more color to this piece.