Tips on how to improve are intensely welcomed  

 First part in a series of sprites I’m making, kind of  in the mood of Alien, Dark Star, Solaris and a bit of Red Dwarf, but crossed with  more light hearted adventure games like Earthbound, all with the GameBoy palette. This my first bash at doing sprites so please tell me what i'm doing wrong, and or not doing.

1. Yuslov: Engineer

2. Kline: Medic

3. Lester: Cook

4. Dag: Captain

5. Albini: I.T 

7. Generic PDA thingy.