I fell for the 'imagination only and reference only' meme and I want to recover by learning how to copy accurate pictures. Are there any good methods that i can practice extensively? I want to be good at all aspects of art. Copying, imagination, etc.

Not sure how to approach it at all since I've only searched for anatomy tutorials or photos to study. Are there good and easy (obviously not eady but doable) methods that i can ease into as a beginner?