An infrared image of a cat an an X-ray image of a cat are drastically different to an optical one, so it's not a given that they'd all draw the same thing.
If the alien is blasting the cat with soft x-rays constantly to perceive it, then it's mostly different because it killed the cat with radiation poisoning.
Shapes and proportions remain the same regardless. And even human artists can be... "inventive", with coloration or emphasis of some features over others.
It seems improbable that they'd draw anything we haven't drawn ourselves.
