I'm ahead of the game here a little but, here's the finished piece! We still haven't figured out who put that bow on Uni. Hopefully, that tag should give us a clue.
Also, Mettaton said he wanted to become a fox mystic this year. If you're wondering why his fox floof is a dark color, he is the black color morph of the red fox. He wanted something natural that could blend in with his hair. Now, he has a laugh that sounds like a chipmunk or dolphin. Anyway, Happy Early Birthday, Undertale! Thanks for reminding us to stay determined for 8 years!