@gregzaal A few things to get you started :
1 : You may want to dress up the interface for your needs using Stylish : https://userstyles.org/styles/browse?search_terms=mastodon
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
2 : Some other Blender fellas you may have missed (not all are very active here... yet) :
https://mastodon.social/@Blender (brand new official account, no activity yet)
https://mastodon.social/@kednar
https://mastodon.xyz/@manujarvinen
https://mastodon.social/@zuggamasta
https://mastodon.social/@mantissa
https://mastodon.social/@bkurdali
https://mastodon.art/@benrob0329
https://mastodon.social/@frd
@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 :
https://mastodon.art/@Krita (fairly new official Krita account but quite active)
https://mastodon.art/@razcore
https://mastodon.art/@therealyton
https://mastodon.gamedev.place/@akien
https://mastodon.social/@patdavid
https://mamot.fr/@Olm_e
Also try the hashtag hugin, it gives many results (as well as the classics b3d, krita, etc...)
@gregzaal
3 : some talented Krita artists you may know :
https://framapiaf.org/@davidrevoy
https://mastodon.social/@sylvia_ritter
https://mastodon.art/@deerbard
https://mastodon.art/@pollomostro
https://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.