Now this may very well be totally *not* what you're going for, because this is a more (Though not completely, by any stretch.) anatomicaly correct *bat* wing.
it's quick and dirty, iknow. but it gets the point across.
Think about bone structure:



As it stands (the unedited wing) it looks as though the flapping motion would cause a giant 'parachuting' effect because of the largeness of the skin between the outer and middle wingbones - imageint ath in motion; it just seems like it would be uncomfortable for the poor ship :\

Sorry! couldn't wait!

well here's another go at it that makes more sense, i knew there was something off about the way he was moving the blade.
So i thought about it and it'd only make sense if he were going to swing, rather than jab -


Or if he brought the weapon to a position from which it would make sense to jab.


Tried to make the "attack' of the attack a little bit more fierce on both.

Big update:

Character walking:

edited using some of the tips found here - http://www.idleworm.com/how/anm/02w/walk1.shtml (I'm 100% certain this has been posted here recently in some other thread; I used it for my own animations.)

rough edit.

AS it is, he's walking rather unusually, and not to rag on it, but his legs look like they're attached to splints preventing him from properly bending his knees. I don't see much wrong with the arm rocking, except his black arm bends the wrong way.

I think you're on the right track with the body bobbing up and down but it's bobbing at the wrong time, i think, unless you're going for a 'skipping' motion, in which case it would seem to make sense.

I also made his hair bob a little bit but that's not really that important.

Your stuff is boring.

It's like a plan. I as no life, no fanzyness. If it's gray, you draw it gray. If it's blue, you draw it blue. That's not art. Art is drawing beautifull things. Things that are fun to watch.

Ok, so if ypou belive I'm right, here what you can do to make this pixel ART.
First, define a light source. This will give you an ambiance you can play with.
Second, change those borring colors into cool ones. A simple way to do this: Your shadow should not be only the same color with less light. It should be the same color with a blue tone, or less saturation.
Third, MAKE IT DYNAMIC! An other view angle could help. But moslty, there is nothing going on in your drawings. BAM! The train exploded! Something intersting.

Here's a quick rough to show you what I mean:

Okay so it's boring because it doesn't conform to you standards of what "art" is? that's hardly fair. read baccaman21's response.
If he wants to go for realism that's his prerogative.
your criticism could hardly be considered constructive because you're basically telling him to start over and draw something else. not everyone wants to rip off metal slug.