This book cover is available for licensing, message me if interested.
The artwork would fit a fantasy story that incorporates a character with abilities like summoning darkness/shadow/a dark power with a magical object like a gem or crystal. Little changes can be made, like the floating crystal I placed above his hand that he does the summoning with.
While the black smoke, background and crystal are made using photos, the character is posed and lit in the 3D app, Daz3D. His pose and looks are easily adjusted which gives a lot of option also for a series of books.