The difference between US and UK book covers

The difference between US and UK book covers.
We are about to publish our first book here at MadeByEducators, it’s not a fiction blockbuster but we still wanted to make the cover as noticeable as possible in both countries as hopefully it could be a great deal of help to a very particular set of parents.
 
We researched the difference between US and UK book markets by looking as US and UK amazon pages’ side by side. Having looked at a LOT of book covers here is a summary of our own conclusions on the difference.
 
US                                                                                                        
Greater realism, cover indicated the contents of the book
Characters more likely to be shown on cover                                                                     
Stronger colours, criticised as ‘more garish’                        
Use of paintings possibly to indicate investment in cover as artist must be have been commissioned
​All the space on the book cover is used                   
 
UK
More abstract concepts. Content of the book’s theme suggested but not obviously
Characters unlikely to be shown on the cover leaving it to the imagination of the reader                       
Subtle use of colours, criticised as ‘dull’
Unlikely to be a painting and does not have to appear costly to have produced
More likely to have a great deal of negative space
 
After researching I have gone back to look at our cover design and it is considerably more on the UK side!