One of the few Undertale fanart pictures I can post here or on Dropbox that isn't actually a spoiler, thankfully. Muffet! This one is owed to nice music and character concept at her point of the game.
I don't actually know who to credit the character to because surprise, while TobyFox brought her into the game, It's actually Michelle Czajkowski of Ava's Demon fame ( https://twitter.com/avasdemon ) that created this character concept. Go spread the word, by the way.
Artwork's mine, course.
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The spiders all dance in time with the music. Really that should teach you not to be such a stingy person.