Just to be perverse: I think the pale background version is now too dull (it looks boring, which doesn't suit the cartoon flavour of the images).
Personally, I think you should leave off the "?". Punctuation in book titles can be confusing when doing searches and so on, so if it's not important to the title then leave it off.
The balance is a little better with the "One nuclear..." text down a bit lower ... it's still not exactly right, though; not to my eye.
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