Aw.D: Well, first, did you try looking around to find tips on line weight? This could help your linearts improve once you master the basics. Also, when coloring digitally, I would say to try not to use the air brush tool too often unless you are really knowledgeable about the cool things it can do to improve your work.
The most important thing to do is to train your eye to judge quality, not to necessarily directly compare your work with others. It took me about two to three years for me to develop that eye just by observing everything around me and those pro artists. This can help you to improve your art in the near future, too.:3
I'm not the best at this stuff either but I'm glad if my tips can help you in the future!^^