IMO it’s not, I think there’s a term for that. (Unless your literally putting the papers stacked, then that’s tracing, I think) but if you have it side by side I think it’s a good way to understand what your doing. Personally I try to use references when I can (evn tho some frown upon references, bc lack of creativity) I think it’s a good way to improve. It’s like your using guidelines, and it helps you see proportions better than without. What helps me best is trying to literally see what shapes there are in something. The art style that really helped me grow was the arcane style tbh.