zlacker

If someone draws a cat, and the next person draws basically the same cat, there is no copyright infringement.

You need something "extra", some kind of style that is distinct.

I'm not saying your drawing has no copyright - it does, if someone reproduces it exactly that's illegal. I'm saying if someone makes the same type of drawing, in the same style, that's not infringement - even if they looked at yours, as long as they drew it themselves.