This piece really made me think. Whether or not it was your intention, I saw this as a critique of the Iraqi war - the demon represented US occupation, etc.
Always remember your work has the potential to make people think. Concept is usually more important than technique (unless your technique is in some way groundbreaking). Not just true for art but for life.
Stepping off the soapbox, great piece with really sharp execution - a few things (like the telephone pole in the foreground) could use some more detail but other than that this is really fantastic.