These are the work of Andrew Scaife, a 34-year-old Bristol-based designer. 

He tells BuzzFeed: "There's some really incredible talent out there making pixel art and it was seeing their work which first inspired me.  At first I just wanted to see how to do it, so after a few YouTube tutorials I had the basics.  My first attempt was making some characters from the third season of American Horror Story.  I then wanted to try something more complex that had more atmosphere and lush backgrounds."