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Pictures of famous cartoon characters often have copyright on them. So, its better to use those pictures which do not have copyright.
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Use whatever you want to if you don't intend to take money from hub pages. You are NOT going to get in any trouble.
Only if you get permission from the copy right. If you use famous pictures from any where you need permission to do so. You can and probably will get in a lot of legal trouble, so I would NOT do it.
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