>>7785387
Get a single artbook going through human body construction piece by piece (loomis, hampton, stonehouse anatomy, whatever appeals to you in the artbook thread)
Today, you're studying, say, the chapter about head construction. Try doing what the book is saying to understand the theory, and then apply it by opening your favorite comic/anime/series/whatever and deconstructing all the character heads that you see. Try to rebuild them the way you just learned. No need to go super detailed, just try to get the basic landmarks/structure right. Repeat until you've filled enough pages for your daily plan. Repeat until you've completed your artbook. Turn it into a daily routine.
It's the most fun way for me, even if it's not "the best" its the one that keeps me drawing and looking at an artbook the longest.