Hello people!

I have to make trees, bushes, palms and all that for the backgrounds of a pixel art shoot'em up game. In the game, the light comes from north-west. At the moment, I have made this:



I have no much experience with pixel art, I'm the programmer, so I would really appreciate your help for:

• Choose better palettes.
• Fix some shapes.
• Make all items more appealing.
• Make suggestions of new trees and even make your own.

Any advice would be very welcome.

Thanks in advance!