The words casually seductive might seem strange, but that's the attitude I get from this smoldering image. The 'take it or leave it' self confidence of a woman who knows she doesn't have to put out any extra effort to attract. She simple is.
Wonderful use of colors with skin hue, make up, lipstick and backgrounds. Of the latter, interesting patterns with wallpaper and lingerie. In a sense, they match, which is to say in theme, not in actual pattern. They both have a bright contrast to her and the sheets she lay upon, airy instead of rich in color.
Color was also used well in the view outside, the sunset furthering the notion of its time to spend in the bedroom, and who better a subject with than her. The clouds matching, yet not hiding the sky writing that continues the adult theme of this whole piece. With that single curl of hair at the top of her head and possible signature to it all.