It's looking good. Don't worry about the ear gaps too much....if you look at some reference screen shots, you can see gaps in the ear pieces.. Yours look fine! I've heard some use glue for the brow...I didn't have to use anything on mine. If I had seen this sooner, I would have recommended painting the inside of your helmet black....it helps keep bright sun light out and makes it a little more mysterious when the kids are looking up trying to get a glance in your helmet....
Nice job so far!