>>16882534Two ways I do it. Go to a fanart tag and find someone who exclusively or mostly draws one person. Look at their likes, retweets and who they follow and you'll eventually find other smaller accounts with untagged art.
Another thing you can do is search up the shortened form of a someones name or of a ship name and then go through the likes and retweets of those fans.
I follow this r18 artist
https://twitter.com/inoCougar?t=9MqjfZINhNzVWuazidJRKQLooking at their rt's led me to this cute lzan drawing
https://twitter.com/ogimaru_yaho/status/1483419118095450114?t=uVTtftW1JinUcPsTT9nRgAAnother thing you can do is use
https://azure-gallery.net/illusts?query=department%3A%E3%81%AB%E3%81%98%E3%81%95%E3%82%93%E3%81%98&cp=true&kenzen=false fans sometimes tag untagged art to this website. What I linked you was just the nijisanji tag so if you want to see art of just kuzuha or whoever navigate to their specific tag. If you're not confident with your JP you should be fine just by automatically translating it with whatever web browser you're using.