i agree with bob. your pieced are way too big. you could make advances when you try to really paint your pictures. therefore you could easily learn elementary techniques. some time later you could try starting pixeling, since this can be very difficult some times.

Most of your stuff is too big, man. It doesn't have much to do with the basics of pixel art. Just line art, and flood fills. There is hardly any technique in any of them: no form , simplistic shading, poor texture, etc. Not sure if you fully grasp what pixel art is mainly about: CONTROL. Each of your pieces are too big to gain control and quality of your pixels, therefore they end up looking very poor, or as if they were done as a speed paint. Sorry for not sugar coating it for you, but I  think you NEED to hear this, as all of your submitted pieces will most likely NOT be accepted into the gallery, as they do not display or show much pixel technique, or meet quality standards. This isn't a message to tell you that you need to leave the website. That's not the case at all. Just to rethink your view of pixel art, in that it's not just using mspaint, to make a fun picture. It's still another form of digital art, and uses the same concept of all artforms, like form, color, shape, texture, etc. Remember, practice makes perfect....

try submitting something smaller, into the pixeljoint forums, and see if our userbase can give you some tips...