A formidable female jazz singer from a fictional 1920s underground speakeasy stands on a dimly lit stage during a smoky performance, wearing a shimmering gold and black beaded flapper dress with long pearl necklaces and a feathered headband, her wavy red hair flowing as she grips a vintage brass microphone, fierce passionate expression, dramatic amber spotlight illumination with deep indigo shadows from surrounding velvet curtains, rich details of art deco mirrors and glowing prohibition-era cocktails, oil painting texture with digital precision, powerful musical three-quarter composition against epic roaring twenties nightclub atmosphere, 4k hyperdetailed digital art