This is KleanOrDerty's (Zen-Hydro/AJ-Rock) MLP artworks back when they did a alot of work drawing them.
Here's where you can see his pony work: https://derpibooru.org/tags/artist-colon-dertikleen

Go here if you want to see their regular artworks: /g/3097943/4a9073aa61

Artist Links:
https://www.deviantart.com/aj-rock
https://www.furaffinity.net/user/kleanorderty (Dead)
https://www.furaffinity.net/user/zen-hydro (Dead)