I think you have the same view like I did when I first started drawing, the basic thing I thought was the more I drew the better I would get, as that is true in many ways there are shortcuts to getting good.
By applying general understandment of the subject you're trying to paint you can acchieve good results in a faster amount of time.
For example, instead of painting thousands of portraits of people, go and study the anatomy of the skull down to the skeleton, learn the names of various muscles etc.
You seem to learn pretty much about colors, that's a good thing. Remember, when you're doing a study, think about why it is like that, why are the colors like they are and so on.