First things first... CONGRATS on your growing family!
I don't know how to feel about the lighting. The low ratio is... OK. It seems there is no real single light source (main light). Lighting that is more "directional" would help shape her belly. I do like the range of tones... often tough to acheive.
I seldom find "out of key" portraits work for me. With all the light clothing, I would like to see this on a light background. One more nit to pick... the creases in the background. It should be easy to retouch though.
Great expressions and beautiful subject!