They are fun pictures but, in my opinion, not professional,.
The first is just a snap shot. The shadow is taking the eye away from subject. Photographer needed to be the other side, the boat shouldn't be there.
Second one is nothing special, to much surrounding scenery.
Last one is an interesting artistic shot.
A woman who worked with me was a professional photographer and I learned a lot from her. This was way before digital photography! You need to learn about light and dark, backgrounds as well as posing a subject.
Before starting a business, you need to get the correct cameras, lens and printers, a lot of money!
Go to local shows, take hundreds of pictures of competitors on the ring, get them thumbnail printed and display them so people can choose to purchase or not.
I do not think that many would pay you to come to their place and pay for snapshots.