-snip- rewording

To start, I would suggest reading the 'what is pixel art' tutorial somewhere on the pixel joint forums. That isn't an insult, as I can see you got rid of those non pixel drawings you had up earlier.

Until you read that, I would suggest that you avoid warning against trolls (a little rude considering PJ has a really friendly community and generally are extremely helpful), and that "if you don't have anything nice to say don't say it" is a flawed rule, considering some of the most soul-breaking criticism can be the most helpful, even if less encouraging. Also, lengthy posts on any forum are generally less likely to get quick responses from people who have less time on their hands. Short and sweet!

But on your art, so I can come off as less of a condescending asshole:
Read that guide, and attempt to practice those good-form techniques while blocking out forms with few colors and refining down. That helped me a lot with my sense of shape and shading.

Good luck and never give up!