Here you find some artists, editors, formatters etc., which I can personally reference to!

Editor

Karla Doyle

http://oopsiedaisyedits.com/

Formatter

Angelique Anderson

https://www.facebook.com/AuthorAngeliqueAnderson

Artists

Silviya Andreeva 

Fantasy, Dark Fantasy, Horror, Object/People Cover, Interior Art

https://www.darkimaginarium.com/

Ruxie Tudorica

Fantasy, Dark Fantasy, YA, Object/People Cover, Interior Art, Handdrawn Character Art/Cover Art

http://www.methyss-art.com/

Christian Bentulan

Many Genres Like Horror, Fantasy, Dystopia, Object/People Cover

https://www.coversbychristian.com/

Vanessa Garkova

Fantasy, Dark Fantasy, Mafia, Dark Romance,  Object/People Cover, Interior Art

https://vanesagarkova.alle.bg/

Frina Art

Fantasy, Historical Romance, Contemp. Romance, Non Fiction

https://frinaart.com/

Uwe Jarling

Handdrawn Illustration & Zbrush Modeled, Fantasy, Dark Fantasy Illustration, Character Art etc. 

https://www.facebook.com/uwe.jarling