Thanks for the comments so far. I think the comment about it being 'too busy' might be right. I might try to increase the size of the image, clipping some of the surrounding detail, and perhaps increasing the type size.
I will check that the contrast is sufficient for B&W Kindle display, but it's really for the display on the Amazon web site that it needs to be optimised.
And yes, it was that fascinating thread on cover design that prompted me to ask what people thought here.
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