if you would have used very diluted glue (water alcohol) and sprayed the whole shabang with it it would have stuck much better while it was flat on the table and let dry....
Not bad at all. For a background feature, it looks pretty good. I'm also a fan of the Liquid Nails/No More Nail glue. Most of my layout holds together with the stuff. Cheap dollar store hair spray isn't a bad idea. Spraying a fine mist of scenic cement would be my option. I did that on most of my trees and they hold on pretty well. Aleene's Tacky Glue is another good glue, as a complement for other glue jobs.
