My personal Alicorn, Twilight's Dusk.
My pony OC but NOT ponysona.

Her name was before Twilight Sparkle ever stepped hoof onto the TV screen.

She was done by this amazing pony artist:
http://silentazrael.deviantart.com/

If you like great pony art go watch her on DeviantARt. she is amazing and worked with her team on Double Rainboom as the BG artist.