Making games is a hobby for me and I don't always have consistent time to do it. Also, I'm terrible at art, so I plan to hire an artist. However I am concerned that after a job is done, if I want to return to the project and add more content, the same artist will not be available for any number of reasons. What can be done to help a new artist maintain the style of the previous?
Should I hire the original artist to create a graphic bible? Or is referencing the original art enough? Or is there an entirely different approach that would be better?
Note that this is not a duplicate of this question, where multiple artists are coordinating simultaneously. In this case, one artist has done their work and is gone, unavailable for contact or future work, and a new artist is expanding the assets.