>>3289751There is, although it's more indicative of how well known the artist is than anything else.
https://www.pixiv.net/search.php?s_mode=s_tag&word=ゆるキャン△100users入り>Yuru Camp pictures favorited by at least 100 users, but less than the next tier (250)The further tiers are 250, 500, 1000, 5000, 10000, 50000.
4chan is probably going to eat the triangle in "ゆるキャン△" so basically just add "100users入り" to the end of your search.
