Below is the muscle structure of the bear you are working on. Those initial file lines that you put in do not come to a dead end. the 1st cut will shape the neck, go around the inside of the front leg an join up with the 2nd cut. The 3rd cut will go in front of the hind leg, around the inside of the leg an come up the back to form the tail. Yes, bears have tails.  Notice how similar the bear's bone structure is to your own. Keeping this in mind, you can see your muscles react when placed in the same position.