Hey [Prospect],
Your website's design is absolutely brilliant. The visuals really enhance your message and the content compels action. I've forwarded it to a few of my contacts who I think could benefit from your services.
When I was looking at your site, though, I noticed a mistake that you've made i.e., search engine optimization. It's a relatively simple fix. Would you like me to write it up so that you can share it with your web team? If this is a priority, I can also get on a call.
Regards,
[Your name]