(From a comment over at CoverCritics.com)

“I think this cover would not pass my test of imagining it with a title in an unfamiliar language. If you were to do that, would you still be able to tell anything at all about the nature, themes or even genre of the book?”

That’s a great idea. If everything about your book cover was the same (pics, typefaces) but the words were foreign/lorem ipsum, what assumptions would your viewer make?