My only advice is to make the instructions clearer. It's quite a simple idea "send a whiteboard photo to XYZ, get a clean version back" but I had to go to a second page, scroll down quite a bit, then click a few other pages to find out exactly what happens when I send a photo. I might be dimmer than the average customer though.
Customers don't need to know how easy (or hard) something is... some classmates of mine are now enjoying a trip to South Africa (to see the World Cup alongside head coach Óscar Tabárez) thanks to some clever marketing... they made a video indexing software (the indexing is totally manual) and marketed it as a solution for soccer trainers.
The actual code was much easier than our own project, but it was visually nice and it was brilliantly marketed. I'm probably going to blog about this if some of you are interested :)