If I call you or someone else on your/their  drawing for being a copy or if it  is based on someone else’s art, don’t take as in “I hate you/them or I don’t want you/them to become better by using the art as reference” keep in mind artists take a whole lot of pride and time in their work for it to just be used by others and us not be credited for it. I’m not saying you can not use it to learn or practice but ask the artist first for their permission or just credit them if you can get a hold of them but don’t go and make art based on someone’s work and call it your own, it is not respectful to other artists and it makes you look bad as a new artist because, in the end, you wouldn’t want your work that your spend years trying to perfectionate or get to the piont you are to just be used by others artists have to help each other.