Not to be a naysayer, but clients will often like the images you give them when they are just decent. Not saying these are just decent (they are not bad actually), but I don't like to lean on what clients say as a measure of good images
I like the concept of the name photo. I agree it could of been sharper. I might also of either centered it perfectly in the frame OR moved it more to one side, potentially trying to position the mom so her belly isn't as hidden by the letters. Thats being nitpicky, but an idea none the less.
The second image is more of a classic pose. This is where you try and show the belly, the roundness of it. Not sure I'm liking the choice of jeans with the flowers that kind of cut into the shape of the belly. It does add a fun element to the image, a bit more colour that goes well with your processing.
The last image is just standard, nothing really sticks out. Its clean, sure, but doesn't scream maternity. Not like all images have to though, but this is just an ok shot, I prefer the other 2.
Did you make any more? Maybe some closeups on the belly, try and vary the shooting angle to get a little higher and not always straight on. Profile shots can be really nice as well and if you can light it to make a slight silhouette, clients seem to like those. I'm a fan of more serious images, with less smiling. People have said I need to get my model to smile more, so working towards getting a mix of more dramatic / serene moments and funner smiley images.
Have a look at some online shots for inspiration for poses and different things to do. But if you are new to maternity shots, I think you have a great base to start progressing in this type of photography