What a warm and beautiful portrait. I think the sepia works well for both of them. With that much love in the shot, you can afford to go easy on the color ;-)
Excellent in duotone. Now nobody can claim anything about skin tones. LOL This is really good cause you started with an excellent shot. I like what it does - it neutralizes color and you just focus on the depth of the image. Good one!
Well due to many comments from this image attached, re the red skin tones, I have processed this origional image, to the above "Sepia" tone look, which is much softer.....