For me, the second image doesn't work. One of the booties is just barely out of frame and, outside the context of the other photos, how would one know it is a maternity photo?
The last image is the best, with nice light and composition.
My Pregnancy Photography Guide:
|Douaumont Ossuary by Eric 54-BNF|
from Armistice Day
|Silhouette at sunset by Jill Hancock|
from Portrait Lens (around 80mm or equivalent - please check the full rules)