I hurts the artist more than you think.
Especially when you post your own signature on it and/or edit out the original artist’s signature.
NO. Just no. Don’t be a that person. Be considerate of artists and their hard work. Thieves and editors irk the fuck out of me. They hurt others and don’t do anything to better themselves.
Like someone’s style? Like a picture? Good. Keep your paws off it and give the artist credit. And then go get some paper and a pencil (or whatever medium you’d like) and practice. Soon enough, you might be making beautiful art that you can actually have legitimate pride in.