I'm not an artist myself but I follow David Revoy, who [0] uses Krita and other open-source software extensively for his Pepper & Carrot comic [1]. His blog [0] is full of posts about how he does his work using open-source tools.

There are plenty of fantastic artists who use Krita but I find him interesting because of how dedicated he is to using open-source software for all his work.

[0]: https://www.davidrevoy.com/

[1]: https://www.peppercarrot.com/