First shot is the best... 
Shot #2 is a little dark, some fill flash may have been a good idea...the pose may not be the most flattering for the model, her breasts appear to be going either way... :/
Not sure why maternity shots always have to include a bare belly.. :/... pretty sure I can tell a woman is pregnant without seeing that.. :/
Shot #3, composition is ok, but the gold reflector give the woman two skin tones, her stomach is a normal tone whilst her face and arm are yellow/green, making her appear a little sickly.
Shot #4, decent lighting, great expression from the man, I'd have asked the model to alter her head a little to add some shape to her jawline, the straight line of flesh between chin and neck could look better/more defined. Again a little too yellow on her face compared to stomach.
Last shot is humorous but suffers from obvious lighting issues.. 