Just a small suggestion, clicking to see the difference on the demo images wasn't clear at first. Maybe you should use one of those sliders that they use for before/after images. I think that would be better UX.
I think that kind of drives the point home. Maybe it's my display or my vision, but I still can't tell a difference between the "Before" and "After" pictures. That's very impressive to me, looking at the compression ratios.
The only way I could make it fairer is to add a magnifying area zooming to 100% but that would be too much work. Hoping that links to images is enough.
