You’ve got some good advice on here. I just wanted to add, pay attention to the small details of your images, for example.
This seems like an interesting idea, and original from the usual baby booties etc. on a baby bump. Tbh, and maybe I’m being dumb, but I can’t say I understand the connection between maternity and nautical. Maybe there is a connection between the parents and the sea? I don’t know, or mind really – I think the boat is quite cute. and the image has a sense of whimsy that I quite like. However, imo, it is spoilt by little things that seem to have gone unnoticed, for example, what looks like a phone, left on the sofa, and the label sticking out of her top.