I've been trying to spend a week or two on one area studying and then moving on to another area.  My thought processes that I don't get too caught up in one area and I can spread my learning.  And then cycle through all the areas and then repeat.    I feel like moving around and studying helps me in all areas such as by shading the face maybe I learn a little bit more about shading the hands.  I like the images that you posted keep up the good work.