Is there any huge significance to that red-and-orange sign on the left? If not, I'd really suggest either removing it or making it much more subtle by making it purple-hued like the rest of the scene -- I find it to be a huge distraction in its current form. The first thing my eyes are drawn to when I see the piece now is the sign, and my eyes keep on making their way back to it. If you're going to make a part of the scene stand out by creating significant color contrast, I'd think it'd be primarily with the two scavengers. I was also a bigger fan of the earlier, dark blue color edit, but I guess that's just personal taste and has less to do with the composition.
I think you did a good job on this -- it looks very nice