Its extremely challenging, but you learn alot from doing it. Its also important to choose only 1 or 2 artists and stick to them and try to learn their style. Ive landed on Edgar Payne and Monet after being a life long Van Gogh stan. Its really useful in developing your own style by blending 2 different masters together. I highly recommend checking out the Paint Coach on YouTube he has a bunch of great videos that really break down the process of composition and getting your values right. Either way Happy Painting! Cant wait to see more of your works!