Great work overall, I think you nailed the atmosphere and the whole chop looks great.
Only problem is that another artist posted this on our facebook page, I can see a huge differnece in the two chops, just watch out that you dont accidently copy another chopper's work as this could create problems.
Anyways, I still think your chop is very good, so just keep chopping and I think you can be pro in no time!