This kind of reminds me of the Twilight Realm from The Legend of Zelda: Twilight Princess. Sad, lonely, and every sound is emphasized because of the vast emptiness and lifelessness that exists there... the only 'life' are the Twili people and the Twili beasts and other corrupted creatures that exist. Most living creatures would become spirits or be corrupted by the Twilight. Nightmare Moon would be like Wolf Link, a lonely creature that cannot be seen by the spirit people (or ponies in the case of NMM) but can be seen by the corrupted beasts. She is on her own.
Hello ButtonsTheCatt, i love this picture so much and i think it would work perfectly with a song i wrote and would love to upload as an MLP song [link] , I know how precious art can be and I would love if you could have a listen to my song first to let me know if you think it suits the emotions you were conveying with this drawing as well, if you do like the song and think it works well then would i please be able to use this picture for my you tube song video i promise you will be credited in the description. Thank you so much my email is email@example.com