I like them, though I have some critism.
1. Their heads are too big, maybe next time try to make it smaller ^^
2. For the first drawing, I'm slightly confused what's going on with the dark blue guy's body? It's very twisted and stiff.
3. The first drawing) the dark blue guy's arm is..huge and their legs are different sizes
4. Their shoulders should slope downwards instead of being completely straight. They look super stiff because of this.
Don't worry, practice will help! Just keep drawing but don't let my critism change the way you draw!