The image the pixel art was based on:
https://derpibooru.org/images/1461874
http://discord.gg/4B4xvpD
(This is the ManePxls Discord server. We are a faction on the site “pxls.space”. In this server, we disscuss designs to add/tweak on the current Pxls canvas, as well as talking about other MLP related stuff. If that sounds interesting, come check out the server!)