Many deviants around here seem to think that if they have seen a type of work before then that means it's not original. So by that reasoning, if someone comes up with the weirdest thing in the world, than that makes him original and therefore better than the one that drew something that has been done before.
I'd like you to consider this for a while. Humanity has been around for thousands of years, almost anything an artist might think of drawing, has been drawn before. If an artist draws a portrait of a girl, that is so "unoriginal" you can literally find hundreds of thousands of such drawings.
Then should an artist stay away from drawing