I've done just fine without using before & after photos of my clients. Here's why I don't use them...
Comparisons and Expectations
As soon you see a dramatic before & after photo you begin to draw comparisons and expectations for your journey. But you are not them, why compare one person's unique body with your own? I want you to see yourself as uniquely you, and before & after photos defeat that.
I honestly forget to take progress photos. They're not important to me. Creating effective programs and caring for you matters much more than marketing.
I think your journey is private and sharing it is up to you. So even if I do have permission to share, I generally decline.
Before & After Photos Show Changes In Size
That's it! They don't tell you about that person's strength, blood work, or motivation. A before & after photo doesn't tell you how they've recovered nicely from a heart attack or eliminated back pain. You are more than your pants size, and photos can't show you that.
Hating the Old You
Before & after photos usually come with a commentary of how much that person hated themselves at that size. I want you to be motivated by love for yourself at any size. I don't want you motivated to "kill" the old you. The past, present, and future you are really neat, and I want you to know that.