Not bad
I will however, provide strict critism >:O!
The lineart isn't bad, but work on the way you make corners or turns, round it out some and keep the curve moving without jagged edges. for example, instead of 1 pixel, then 2, then 1, try 2, then 1 then 1.... ._. if you get what I mean at all... XD
The colors look a little faded on the first one...
You don't have to post you're pallette with it ._.
Try not to group to much of your darkest color together, for example on the 1st gun, the black pixels that hold the scope up, or even the hilt of the gun where it comes to a sharp point o_O. Also try to keep a notisable difference between colors. I cant the alot of difference between your darkest green and the black on the 2nd gun. :o