Artist list

Horror (and other relevant) artists that accept commissions:

https://www.deviantart.com/aoxenuk/gallery/
https://www.deviantart.com/almanegra/gallery/
http://cinemamind.tumblr.com/
https://www.deviantart.com/ladykraken
https://www.deviantart.com/schizosvenia
https://www.deviantart.com/lorandesore
https://www.deviantart.com/spacefur/art/Play-with-me-705625243
https://www.deviantart.com/sara-scmp/art/Commission-Open-780666478
https://www.deviantart.com/fourtwonine429/art/OPEN-Mr-W23-Commission-Sheet-773254103
https://www.deviantart.com/aryoshka/gallery/
https://www.deviantart.com/itowwx/gallery/
https://artof3dbrooke.weebly.com/

Artists that have accepted commissions at some point; unclear whether they do now:

https://www.deviantart.com/frankheilerart/
https://www.deviantart.com/sickjoe
https://www.deviantart.com/9-1-9/
https://www.deviantart.com/quietsecrets/gallery/

Currently closed (as of 2019-03-22):

https://www.deviantart.com/marcelafreire
https://www.deviantart.com/raven-blood-13/
https://www.deviantart.com/scissorsrunner/art/Cthulhu-764901932
https://www.deviantart.com/aliceofbunny/gallery/
https://www.deviantart.com/shawn-langley/gallery/
https://www.deviantart.com/myemeraldtears/journal/Commissions-for-2018-573093506

Interesting artists. Unclear whether they accept commissions:

https://www.deviantart.com/diazeram/gallery/