Concept Art Digital Illustration for Sci-Fi Characters

Looking for creative concept art and digital illustration creators.
I have a Sci-Fi book series, and I'm looking to create full illustration concept art designs with graphic characters based on it. For this, I need you to create 52 concept art designs with one character design in each art and a detailed background scenery.

I can give you tentative photographs, general description of the illustration and ideas of most characters, but the illustration designs have to be unique..

Some characters would be human while some would be superhuman.

All of them would be full illustrations..

Please share time, cost, and portfolio.

What I need:
- High Res Image
- Source File
- Full Copyright

Sample designs of what I'm looking for:

https://www.shutterstock.com/image-illustration/mysterious-man-sitting-under-futuristic-portal-1794244546
https://www.shutterstock.com/image-illustration/fantasy-anime-girl-glowing-eye-digital-2053905422
https://www.shutterstock.com/image-illustration/creature-branch-head-playing-magic-banjo-1084620026