Very nice work. The think I like the most about this is the bold brush strokes - great job with that. Also, I really enjoy the print patterns you put on her kimono, and in the background....and the subtle echoes of her silhouette in the background. This is very good work in my opinion; the bold lines and bright colors (great choice in colors, by the way) draw you in, and the details keep you hooked.
i personally think its the yellow colour scheme and simplicity that makes this so awesome most japanese/geisha images are quite dark and complex, nice to see a different take on it. i really really like it!