I like this a lot! The only thing that bothers me is the strap. Since it goes off to the side rather than staying in the frame, it brings the eye along with it. Other than that, great shot!
Nice idea... took me a min to work out those are coins dropping in front though I'm not sure they bring anything to the picture... perhaps if there were a few scattered on the floor already by the bag?
The moving coins are weird - almost unnoticeable, and i can't see the point of them. Technically a very good photo, absolutely no problems there, but I can't really see it's relevance to the challenge - did people never have money bags before? Is it dated somehow and I just don't know that?