Sometimes people tell me I'm good at drawing, but compared to the amazing artists on DA, I still have lots to learn!

I always try my best to improve by studying and practicing. Already by making a conscious decision to improve, I'm producing
a lot of creative stuff I wouldn't have been able to make earlier!
Right now I want to be proficient in all these areas:

Human figures, anatomy, proportions

Posing, dynamic posing

Urban backgrounds, perspective techniques

Nature backgrounds and landscapes

Digital painting, realistic lighting

Animal anatomy, perspective

Realistic expressions
Whew! That's a lot to learn, but I'm trying my best.

Is there anything else I should know in order to improve as an artist?
Please link me to helpful tutorials, I could not have improved without the countless number of epic tutorials found on DA!