General:

• Louie Zong
• Yumi Kitagishi - ♡

Fairy stuff:

• Brian Froud
• Wendy Froud

Pixel art:

• Paul Robertson (cute, bright graphics reminiscent to nitrome games but seriously, viewer discretion advised! Tw: nsfw, blood/gore, several other stuff I've probably overlooked)

Playfish game art (Pet Society, Restaurant City):

• Andreas Polyviou (their Restaurant City stuff)
• Marby Kwong
• Perana S