Information and definition of pixel art from Wikipedia: https://en.wikipedia.org/wiki/Pixel_art
Something made in MS Paint isn't necessarily pixel art unless it was edited on the pixel level. Things like auto-AA or auto-blur tools aren't usually in pixel art either.
Guidelines 1. Be polite to other users.
Post your own work with the [OC] tag, other people's work with the [NC] tag, and discussions with the [DISC] tag.
Upload your work to an external image host, like imgur or tinypic, because Snapzu only outputs .jpg files at the moment, and this ruins pixel art's quality.
Give constructive criticism. When possible, try to explain how to fix things rather than just claiming that something is bad.
PM me if you have any other questions.