I've deffinitly got to stop with my dithering.
I have no idea how to do it.
I think in most of your pieces, they are generally too noisy, especially for their small size. I don't think dithering is needed that much here. Again, more flat simplistic shading will do the trick, in my opinion. I also got rid of the extra redish hue that was in the aliens body. I thought that it wasn't necessary to have it, since it was already so close to the purplish/reddish hue you had in the beams and such. Not to mention, I tried enlargening his chest to show deep panting, as well as widen his eyes, to show fear...
Hope to see an update!