You might find it weird but what i'm saying is worth a try.the best way to be creative in anything is to think like  a kid. I mean small children have  a wild range of imagination. They think of whatever they want . but we senior students develop a condition of defining an object. so we miss out the wild craft that can be done.
So according to me try to think like a child.
When you are copying someone else art you have to put your own creative ideas in it, so that it will be useful for you also. 
here i showed you a picture, right/ so just imagine i made this picture myself. now if you are copying mine then make some changes like putting a weiad eye lashes and the make the eyes orange or something else with your own creative ideas!
thank you.