and I usually prefer b&w, but I think I like this better in red.
As far as the rest of this...
The only suggestion I would make is maybe have her turn slightly to reduce that little bit of tummy and have her bend her elbow just a bit next time. I think the angle she's turned makes her torso look odd as compared to her bum. Like you took the top half of one photo and the bottom of another.
I really like it though, and you're lucky you wife will do this for you. I keep trying to convince my husband to do it, but he says no one wants to look at pictures of naked guys.
adina