You may have to rotate or change the view several times to get the arms to go where you want them to. Keep in mind that when people walk, the legs and arms have opposing motion: right leg forward means right arm back. It might take a while to get things just right, but be patient — learning to create poses does not happen in an instant. If you can do so without feeling silly, you should try walking naturally around your work area, observing how your arms and hands swing and twist to give yourself a reference. Of course, if you have a video camera available.
