1girl, blonde hair, blush, buttons, cosplay, frilled hat, frills, hat, holding, holding instrument, instrument, long sleeves, lunasa prismriver, merlin prismriver, merlin prismriver (cosplay), musical note, one-hour drawing challenge, open mouth, pink headwear, pink skirt, pink vest, pointy hat, ruu (tksymkw), shirt, short hair, skirt, solo, sweatdrop, touhou, trumpet, vest, white shirt, yellow eyes