Yeah, I thought about using something sticky but I'm leaving damaged Ironhide in vehicle mode for a while so I didn't want to one day find the finish had been marred. The windscreen is curved so you have to slightly bend the corners/edges of the paper with your fingers to get a more snug fit. There's also the battle damage gouged out bit from the plastic near the wiper that you can't do much about.
Anyway, seen on the shelf, overall it looks pretty good for me.