First off, your work is amazing -- I've never seen anything like it. Absolutely jaw-dropping, and not just because of your medium. But I see you repeatedly mention losing quality/colour and detail when you scan.
They still look utterly amazing, but have you considered taking photos of them as well? With a good enough camera and lighting you could get a result just as good if not better than scanning to show off the full quality -- whether trying to imitate a scan with the photo or not.
I've seen paintings that look amazing photographed but completely washed out when scanned, for example.