[WIP] My First Pixels, Please critique

[bjl]

Hey everyone.  A bit of background, I became interested in pixel art after playing Cave Story, so I decided to try some of my own, and I'm really enjoying it.  These are my first attempts after reading The Way of The Pixel tutorial.

Anyways, here is a 16 x 16 standing alien sprite I made -



And here is a grass tile I made -



And finally a tessellation of the above tile



I'm very frustrated with this one because I'm having a hard time eliminating the grid look, so any comments in this area would be especially appreciated.

[Mabelma]

Here man I posted the images for you.
Alien:

Grass:

Mockup:

I'lll post some C+C on them later.
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Fixed some things. On the sprites.
Alien:Fixed a bit of the shading but you need to do the rest. Also fixed the feet and made him symmetrical.

Grass Tile:Added some pixels to eliminate the grid see the mock up and tell me if I did it.

Mockup:see for your self.

I Hope you don't mind I Edited the sprites.