Here's a quick video to give you all a brief introduction to compositing in Blender. It's much more effective than using Photoshop, especially with the advantage of Cryptomatte masks.
After this the image goes trough adobe lightroom and some other post work, only then to Adobe illustrator for the novel.
Video in the attachments.
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DISCLAIMER:
All characters depicted in this content are fictional and are portrayed as being over the age of 18.
All depicted actions are intended as consensual and are presented solely for the purpose of artistic expression.