I really don't like the top (navy-blue background) one - contradictions between the fun font and the boring/serious background and images.
I do rather like the second (light blue background) one. Despite having said of your OP example that it was too cartoonish, in this case the cartoon seems to fit with the tag-line text and make it come out okay ... sort of. But there is something wrong with the balance. I can't tell you how to fix it, but it's wrong. (Oh, and the orange text is a bit hard on the eyes when up against that light-blue background.)
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