Absolutely fine to make changes and link it back here. The only requirement is to not sell the models.
As a matter of fact, I look forward to additions/improvement to my models. After all, teamwork is my motto!
Have you seen the Cheshire Cat picture with the glow in the dark filament? Personally I could not get a good picture of it but this maker captured it perfectly:https://www.thingiverse.com/make:495309