wow you even have the chest moving a bit. I can tell you were using the pen tool in flash by looking at the tricep. I'm always reluctant to use the pen tool because it's so random but you know when and how to use it. This is really awesome, I can learn a lot from you.
if you want to loop the animation . Select all the frames that you want to loop for example the begining of the walk to the end of the walk. Then right click the selection in the time line and click on copie frames. Then click on insert at the top of the screen and select new symbol. the program will ask you to name the symbol but more importantly it will ask you what type of symbol you want to make it. click on Graphic.Then paste in your frames to the symbol time line.
then click back to your scene. You can check that your symbol is working by selecting it in your libary and hitting play. then you just place the symbol into your scene and move it around till its in place with your animation.You do this by making a blank key frame and putting the symbol on it. then ajust the amout of frames that you want it to play for. it will loop automatically.hope that help.