Hi, I am not an artist but just want to say your story sounds interesting. From your post, I guess you are looking for an artist partner, where both of you can work on the idea to create something beautiful and hope it does well enough with your audience.
I think it may help if you can include information in your post about:
-Whether you've written/outlined the story or if there's a script.(number of chapters etc)
-Links to your previous written works, if any
-How long you want to work together on the project for
-Workload split
-Future revenue split if possible.
It's difficult to find an artist especially if it's an unpaid collaboration in the initial stages, but it's not impossible.
Wishing you the best!