Masked vampire woman entering an art nouveau halloween party

An Art Nouveau painting of a very attractive woman in a black Halloween costume, wearing a vampire costume with a mask over her beautiful face. Her long dark hair flows behind her as she walks into an exciting Halloween party. The scene is rich with swirling organic lines, stylized floral motifs, and a muted color palette of deep purples, blacks, and hints of crimson, in the style of Alphonse Mucha and Gustav Klimt, exuding an aura of mystical elegance and gothic romance, with dramatic chiaroscuro lighting.