The Big List Of Pixel Art Tutorials

http://www.petesqbsite.com/sections/tutorials/tuts/tsugumo/
http://www.lesforges.org/article/cours-pixel-art-preface
http://www.hongkiat.com/blog/pixel-art-tutorials/
http://rjanes.com/tutorials/pixelling_a_monster_sprite.php
http://www.pixelprospector.com/the-big-list-of-pixel-art-tutorials/