How to draw manga books helped me a lot. The thing that's helped me the most is figure drawing class. I highly highly suggest anyone who wants to draw people well, especially for anime, to take that class once they get into college. Anime is simplifying the human figure and when you know where everything is it makes it so much easier. Also you can develope your own proffessional style once you know how the real human body works. Draw as much real people as you can. Shade them... try to avoid drawing outlines for a while and hone your skills. Yes classical/traditional studies can be boring in comparison but it has helped my SO much. It'll help you. For now I'd suggest drawing from an anatomy drawing book. Also, it helps immensly for putting the figure in space. I didn't know how to have two people together, or have a human figure sitting very well or connected with anything else in general. Now, I can draw my person doing whatever I want. Trust me. This helps. A lot. :)