it was a little tricky take this photo.. a lot of try so thanks to my girlfriend that always gave my help and suggestions, and most important her time!
i've used a very long exposition, and used the "hat" trick :). this trick consist in using a very long exposition and to cover the lens with something dark when there is something that you don't want to remain in the image. so i cover the lens during the movement from a position of the arms and the next, and leave it free to impress the sensor in the right position.
..anyway i'm start to be disappointed to the voters without camera. they always gave me low scores that pull me down in the final result.. maybe they don't understand how is difficut make some photos! i would really like to see them in action!