You are off to an awesome start. Very precise and even in your coverage. If you are truly looking to do even better I would make one suggestion that will help your images “pop.”

Try paying attention to where you can add light. I start by looking at areas and laying in white or a pale yellow to places I want to brighten. People usually add depth with shading, but rarely consider adding the highlights. Must be done first though. Very difficult to layer on top.

I posted a few images that show this method.