Cartoonist Mark Crilley has made over 200 high-quality videos showing how to draw people and animals in a semi-manga style. My daughter Jane and I like to watch them and sometimes we draw along with him. Even if you don't draw along with Crilley, his videos are a joy to watch, because Crilley is a very talented illustrator. He has interesting things to say about drawing, too.
Mark has a book out, too, called Mastering Manga with Mark Crilley: 30 drawing lessons from the creator of Akiko.