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Background is a little better color, try even darker next time.
The most contrast is best. If you can get enough light on it then try black.
Too bad the edges are not better yet. I have an old...

You need to change the background for photos to show the edge better.
Try black, Robins egg blue, even white might be better.
The right lighting and background makes a HUGE difference.

I never said it couldn't be done, I said the opposite. It CAN be done but not with the same quality result.
I absolutely agree about slates and Coti's (Escher excluded) The stone at its finest state...

I'm not sure as i didn't try it.
I find - generally - that using a slurry on a fine finish stone from a relatively coarse start (1-4k) never produces an edge that you can get through a better and...

I have a vintage Lune and when I tested years ago the lune would improve the edge from a 20k Gokumyo ( I used water only) but a minimal number of strokes had to be used. Say 10-15 max.
This would...