pixel art concepts  

(emphasis on concept)

http://i.imgur.com/NuG9kaD.png

http://i.imgur.com/hIG9UXF.png

http://i.imgur.com/K4LsQvx.png

http://i.imgur.com/t0jOn5B.png

http://i.imgur.com/bKHRwpS.png

http://i.imgur.com/pfXSlW7.png