My highschool art teacher told the class that you have to change at least seven things in a picture to make it your own. I don't know if that's legally right but it's at least quite good enough to show a young child the difference between plagiarizing and drawing inspiration from something. Think of that mcdonalds commercial "oh I wish I was alreDy there, instead of here, playing this song. Oh I would have a big chocolate shake, a cheeseburger, and also, whoops, and also fries. And not share any, with my dumb brother. Da-da-da-da-da-da-da-dut". Duh duh, duh duh, duh. Of mcDonalds."
