This scene is both mysterious and captivating. The man and woman, set against a shadowy backdrop, are seated at a table with a large crystal ball between them. The woman holds in her hands a card with an invitation to a ball, looking at the man pleadingly. His arms are crossed and a look of defiance is set on his face.
As far as coloring, I would recommend using jewel-tones that complement the magical feeling of the scene. A deep, rich blue for the woman’s dress and a golden light coming from the crystal ball, could contrast nicely with a dark, rich green backdrop. The man could have a charcoal suit with a bold pattern that draws attention to his strong features. The contrast between the woman’s pleading look and the man’s defiant pose could be amplified by using light and dark greys to shade the faces, with a pop of red or purple on his tie, to further illustrate his resistance to her offer.