Really an intersting choice of angle and moment. I think you chose wisely as it illustrates the need to "put your head down and go to work". The emphasis on the shadows eliminates the need to dispaly facial expression yet conveys the story. I think you've presented a well thought out portrayal of an entity embarking in one of life's tasks. Nice work.
I like the concept but I don't think there is enough context in the picture to tell that this is anything but a person bending over with some specks of something on her shirt.