Two main issues I see here: One is the background; while you've rendered it nicely out of focus, there's still enough in it to be very busy and distracting; look for even, calmer backgrounds, the other is the fact that materinity photography is all about the woman's "bump" and in each of these shots you've crowded it to the left-hand side of the page (remember that since most of us are used to reading left to right, our eyes naturally start on the left side of the frame and move to the right where there's nothing to hold our attention) and all but obscured it with arms (I agree with the football analogy above). They're a good start, but I think there's a LOT of room for improvment. I would suggest offering a re-shoot and trying a few more poses/compositions.