Create a concept art illustration of an elderly witch in three different poses, depicted in a whimsical, caricature style. The witch should have circular shapes emphasized in her design--rounded features, a circular hat, and flowing robes that curve softly. She carries or is accompanied by a mystical bird, designed with exaggerated, circular elements to match her style. The witch's clothing and accessories should be in rich shades of violet, from deep purples to light lavenders. The overall look should be playful yet slightly mysterious, with the bird adding an extra layer of magic and intrigue. The background should be minimalistic, allowing the character and her bird to stand out.