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If you drew too long or too short bones you can correct it but it's difficult. You need to select the one of the end points of the bone next of the bone you want to lengthen or shorten. This means if you want to stretch the bone between 2 and 3 then you will need to select either 3A, 3B, or 3C. Then go to the properties panel and enabling "Joint: X translation" and "Joint Y translation". An arrow cross appears on the joint base and now you can move it around. Be careful, sometimes it tends to have its own will where and how to move. When you are done, disable the X and Y translations, and there you have it. You can also use constrains to limit the movement or angle of joints when you are positioning your bones. Spring and dampening functions will add a bounce to the shape as it folds.