It is the site of Brazilian art is pixel with white background, so it uses the AA that way. I suggest you to use an external AA because it values the work.
I'm still very new to AA and shadows with much more training I'llevolving and improving ^ ^
Very good! Such nice colors.
I don't understand why you AA'd outside of the lines, it looks horrible against the default PJ background. Perhaps your background canvas was white? You should definitely remove it though now that it's transparent of a background.
Keep it up!
Use só AA interno, pois quando for postar aqui ou na pixelaria fica mais suave.