Here's my Prototype:

Personally when I first conceptualized the story for my book and drew the sketch for the cover, I had a different idea of how I wanted the relationship between the main characters to be and how I wanted it to develop.
So originally, Caspar Shaw (the MC) was a 18 year old who was traveling the country with his childhood best friend Malakai. Caspar was supposed to be fatally ill, and It would be revealed later his best friend was actually a demon, and Caspar had sold his soul so he would have someone with him when he died.
I decided later I wanted more paranormal elements, so I changed the story. Now Caspar is a 25 year old searching for his missing mom and uncle while hunting monsters. Instead of wanting a companion to die peacefully with, he contracted Malakai to "be his friend," under the hope that Malakai would help while not betraying him or twisting the contract (since, that's not what friends do.)
Anyway, here's the updated cover!

and some drawings of Malakai's updated design:


Eventually, I would like to draw them in a similar pose as the first one though. Caspar is always going through so much he deserves some fluff hehe.
But please, share your prototypes and new covers, and share the backstory if you have any?