The coins don't appear to be in sharp focus, this may sound odd but the lack of colour in this colour image makes it look flat and uninteresting. If you convert it to greyscale and make it a definate balck and white image it has more punch. I would alos crop away all that excess dirt on the right and get rid of the bright patch at the top.
A very literal concept - which is fine. But I think you needed to light the subject better and the composition is a little off. Camera needs to pan left a touch I think.
The corporate "negative" seems to be a big feature in this challenge - lots of burning, blood and, in this case, dirty money… This is my favourite from the bunch and I can't see how to improve the picture…