"Gris" is a lovely portrait done in Duotones and meets the challenge. I think the challenge become extremely hard when we have 600+ entries, especially because I think voters do get burned out or they only vote on the 20% they like. Taking all that is consideration I am really glad to see you were in the top 30%.
The image is is very nice and clean. I think the most appealing attribute is the eyes, I am sure it is just my preceptive but that is what captured my attention. The light being captured by her eyes is almost enchanting. The lighting you used is wonderful. The light across the face accents just prefectly without createing any harsh sahdows. Also I think your lighting displays itself in the highlights it is able to pick up out of her hair. The focus is very nice. I really don't see anything I would change or even want to try. I personally would be extremely proud of this image.