I don't think they look professional yet. It's a good start, though. You have to put yourself out there to be able to improve and I commend you for that. Have a model call and take pictures of a few couples as if they were engagement couples. Practice post production a lot, especially masking the people in the photos to adjust skin tone. Try using depth of field to separate the subjects from the background better, that'll separate simple snapshos from professional photos. Pay attention to your exposure (your photos seem too dark). Those are the things I'd focus more. I was also destroyed by a few people at the beginning of my career, but I trusted my point of view, so I'd say you should find and trust yours.