photobucket? the entire internet doesn't like bitmaps. It's not a web format.
--- onto something more relevent ---The robot's lines could be made more interesting, I would suggest that you use it as a practice piece to refine your coloring and lining skill, it's a good size to start out on. Try er-working the shading, right now everything just looks a little smudged. Take a look at some other robot pixel arts, i think there is a video in (
http://www.wayofthepixel.net/pixelation/index.php?topic=2144.0) this thread that has to do with robots, or a robot, at least. Try to stray away from an all grey palette (that is, until you become very adept in pixel art, then move onto photography in your later years, and take all black and white photos as a stylistic choice and everyone thinks you're really 'deep'.) *AHEM* anyway, yeah, you have so many grays in such a small area that it just looks like the gradient tool in photoshop. Try to pick about 3 shades and then define areas so there is more of a sense of volume to each individual 'chunk' of the robot.
The pose could be more intreguin, maybe seperating his legs and having him face the viewr more, and turning his head slightly would make it more dramatic. If you look you can find sprite sheets of all the Megaman bosses, they have some really dynamic poses that would be good to study.
Best of luck.