One thing I like about living in Japan: I can read Japanese manga technique books for free. The book I picked up from the school library was Tokyo Institute of Animators’s 思いいどおりのキャラが描けるテクニックBOOK, or Character Technique Book (literally “techniques so that one can draw the expected character”).
Character Technique Book is a 単行本, or tankoubon, meaning “special volume” usually from a series of lectures.
This book’s best aspect: showing how to draw people, weapons, animals, and places from the preliminary sketches to the finished product. Even how to color pictures (digitally and traditionally) is outlined. For all emerging comic artists (and those who can read Japanese), I would recommend this book.
There are also other technique books like this such as Cool Male Characters Technique Book (loose translation of カッコいい男のキャラの描けるテクニックBOOK) and Cute Girl Characters Technique Book (loose translation of かわいい女のキャラの描けるBOOK).
Character Technique Book is available for 1050 yen on Japan’s Amazon website. You can also find this book as How to Draw Manga Character Background Technique Book on Amazon.com for $33.18.