Thank you. :B
I'm really a novice. This is my first serious work in it the first time I used the anti-aliasing. I would be very grateful if you would help me deal with this, because I feel like I did something wrong with colors.
The shading of this type I used because I did not have enough experience to come up with something of their own.
What the newbies like: the explosive dithering and amount of colors. Oh well, lemme explain: having a lot of colors in a piece isnt very well seen, we usually use up to 16 colors max for a piece like this one. Also, the shading you used (dot by dot) a.k.a dithering is what I used too, as a newbie. It isn't bad, but it's hard to use and gives an unusual texture. Of course I'm not saying this is bad or im better, this looks really good. So go on, continue pixelling, and you will one day be a brilliant artist. I think we all have the same chance at being good. We just gotta try. 
Thats not a problem dude, you have a lot of options: post a WIP in the FORUM section and get help, observe, and train. Some people think its impossible to be real good at this. I'm seeing the others progress: as long as you try hard enough, you'll succeed ;)