Yes, It's pillow shaded. You really need to stop doing this. shade one side only, lighten one side only. Pick where the lightness comes from and the darkness comes from, neither can come from both...errr at least in your case as it would be hard for you to draw light coming from completely* coming from the back, or shining completely infront like a flashlight pointed at someone...
It's completely out of porportion. The overall parts of the person here look like flat blocks...his head looks flat because you didn't add enough volume to his hair. The actual eye sockets themselves are the wrong shape and his pupils far too large. There are many flaws, but I'll just mention those to begin with.
I would recommend looking at peoples pictures in google and sketching them in pencil as what has been said above. You need to break a persons anatomy down into chunks...A persons head is egg shaped, a persons eyes are rounded slits, the shoulders are oblong shaped balls, the chest is a series of different shapes stacked ontop of one another.
Please go to boarder's or which ever book store is near you and find a basic drawing art book and work from it for quite some time. IF you do not work for many years you will not get better as you'll quit and then your what skills you've gained will diminish. Any form of the arts (music, drawn art, etc) is like a muscle, use it or lose a portion of it and become rusty, unable to gain momentium.
I have drawn art since I was 5 and I'm still not even close to "mastering" pixel art, as mastering something such as this is a life long journey and one cannot truely master something as you can always learn something new.