It's been a pleasure working together! I hope you're thrilled with the finished product.
Testimonials are a great way to help show prospective clients what it’s like to work with me and how I can help them achieve their goals so any thoughts you could share would really be appreciated.
If you'd like some thoughts on where to start: you can share about how you felt before we began working together, any tangible results you've received since we've finished, any compliments you've received, how it was working with me or how you feel about the final product now that we're done.
Don't feel pressured to write something long - short and sweet is great too!