Did god make a mistake?

I ponder about some of the more important aspects of life while I study for my exams, like this for example:

God created man in his own image. Yet Adam and Eve are shown with a belly button in every depiction. Does this imply that the painters were not painting reality ? If they did, that would mean god has a belly button! What did he use it for ? Storing his mana ?

Also, if the painters were in fact *not* painting reality, can we trust any paintings at all ?
I wonder...