Add a little intro to this gallery/service you offer. For example, talk about why capturing this type of session is important, what it means to you, and what it's meant for past clients. It doesn't have to be super long! Just a few sentences is great. The secret to doing anything is believing that you can do it. Anything that you believe you can do strong enough, you can do. Anything. As long as you believe.
Add a little more detail about what they will find in this freebie and how it will make their life better! Paint the picture of what the value of your freebie is!