No.
My lawyer wife often advises on this for craft magazines.
They way she typically explains it, the law varies but most fan art falls under derivative works which is specifically forbidden without written consent.
However, most companies see fan art as free advertising and do not aggressively go after artists. Some, coughDisneycough, are more aggressive and hire firms to monitor the internet.
Regardless Small Giant listed this sub-forum as explicit permission
“ Would you like to share your video, fan art, stories, poems, pics or funny experiences related to the game? Feel free to share! <3”
However by posting here you forfeit some of your rights under law, see game TOS and forum TOS.