Picture comes from a 2020 illustration collection. Found an artist listing here. Therefore, the artist is one of:
左 - Hidari (left side)
岸田メル - Kishida Mel
あずまあや - Azuma Aya
水炊き - Mizumoto Tadashi
よむ - Yomu (sgt epper)
比村 - Himura Kiseki?
赤りんご - Aka Ringo
比良坂真琴 - Hirasaka Makoto
べにしゃけ - Beni Shake
まさる.jp - Masaru.jp
皆村春樹 - Minamura Haruki
ののこ - transpot nonoko?
栢森たま - Hakumori Tama
粗茶 - Socha
きのこむし - Kinokomushi
すまき俊吾 - Sumaki Shungo
蒼馬みずき - Souma Mizuki
ととねみぎ - Toto Nemigi
みずきひとし - Mizuki Hitoshi
ZUN - ZUN (artist)