With apologies in advance to the artist, I am going to break an unspoken rule of publishing and say in public that I really dislike this cover. When I first saw it, I knew the book was doomed. I don't mean to disparage a talented artist, and I know this style is considered "traditional," but it is emphatically not my style. When I look at it, "lurid" is the word that comes to mind.
I have never much liked the idea of illustrating a specific scene from a book. Most mainstream books don't do it. It seems to be a device reserved primarily for science fiction and fantasy -- and it's far too easy to get it wrong. Take a look at the above as an example. See those gigantic spider things? They're not in the book. The actual "spiders" are about knee-high, and much simpler in appearance.
I suppose that if such lurid illustrations sold books, I should not complain. But is it possible that if Limit of Vision were dressed up as the near-future techno-thriller it is -- say with a sleek, techno-biology oriented cover in silvers, with accents in greens and blues -- that a lot more readers would give it a look? How many people want to be seen on the train reading a book with giant spiders on the cover?