So I found this thing... more specifically a website with a few very helpful and useful tutorials on pixel art. I'm not sure if this classifies to be in this particular section, but it certainly is most helpful here.
rpgtoolkit.net; Lotusware's Pixel Art Tutorial. I found this quite interesting and thought it a good place for more beginner artists to grasp their roots at pixel art. You can navigate though several other pixel art tutorials as well. Fairly helpful articles if you ask me.