Caetano Veyssières is a user on mastodon.art. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.

@gregzaal No way !
Welcome to Mastodon,
I told you it wasn't gonna die !
It's a happy place for me now

@gregzaal A few things to get you started :
1 : You may want to dress up the interface for your needs using Stylish : userstyles.org/styles/browse?s
I personally use the Variable Width and the Single Column (Simple) themes. If it doesn't work on a particular instance of mastodon (like mastodon.art), it's because the url is not included in the theme script, so you'd have to edit it and therefore install the Greasemonkey browser add-on.

@gregzaal
3 : some talented Krita artists you may know :
framapiaf.org/@davidrevoy
mastodon.social/@sylvia_ritter
mastodon.art/@deerbard
mastodon.art/@pollomostro
mastodon.art/@citylights

I follow many more people and groups/companies/legal entities, some you certainly know, you can see them in my profile and read their bio to see who they are.

@gregzaal in fact it's been a while since I searched for libre graphics folks here, so let me add a few to the list :
mastodon.art/@Krita (fairly new official Krita account but quite active)
mastodon.art/@razcore
mastodon.art/@therealyton
mastodon.gamedev.place/@akien
mastodon.social/@patdavid
mamot.fr/@Olm_e

Also try the hashtag hugin, it gives many results (as well as the classics b3d, krita, etc...)