Space Marine-esqe Character Critiqure

[DatPixelArtistTho]

I drew this guy yesterday:


And as much as I like line art, I think pixel art is much prettier to look at so...



And I also wanted to make a smaller version that took less time to animate:



The reason why there are so many occurrences of jaggies and banding  is because these were done fairly quickly with a graphics tablet. So anyway, is there anything I could improve upon in the design?

[DatPixelArtistTho]

Bump

[dpixel]

Could use better definition by more sense of lighting.  And yeah, the jaggies, as you mentioned.
edit of some parts:

[Ozego]

Nice design on the suit.
I'd suggest to focus on figure drawing when making larger sprites like this. Think about the basic blocking forms of your pose and how everything relates to each other in space. Try to make a little sketch on the side where you draw everything like boxes. Also try to avoid straight stiffness in poses. In the real world even with super simple poses like this there are tons on small shifts in the body. Curve it up and get a nice flow.
There are tons of great tutorials on youtube that can explain it better than I.
Things to google: Gesture drawing, figure drawing boxes, figure drawing line of action