Tell you what, I'll sell you my old Note in exchange, your Dante example renders just fine for me! I always have issues with this but generally speaking in my experience it is publishers cutting the epub short (possibly because a lot of what I read is from a library) so they don't render the illustrations in hi-res. So, no matter what device you use, including a computer screen, it will still look bad.
I assume that when you are reading ePubs you just hold your finger over the illustration until it pops into image viewing mode in NeoReader and then you can zoom to your heart's content? My software is a bit older than yours so you may be able to play with the image contrast while viewing the image, my Note seems to allow you to set image contrast settings and when you zoom in, you lose those and have to instead rely on the global image contrast settings.
(I use Moon on non eInk devices and otherwise use the native apps on my eReaders)
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