ultramarineandwhite: has several pieces featuring Lars, Claudio, Alisa and some other Tekken chars.
lag: IMO, one of the coolest new artists I've found, posts art of every char and one of his panels is even in the game now! (For Law players)
gdaigonΛЯT: Frequently draws several different Tekken chars.
Jasmin Darnell: Not specifically a Tekken artist, but she is the costume designer of Lili in Tekken 8.
hungry_clicker: general FGC content, sometimes Tekken related.
Hanny: more of a general artist now, but still occasionally draws great Tekken content.
Do you have any others you particularly like? I'm looking for more to follow too, let me know.