That Helmet build looks great. The Ears are looking very good. Great Work!
The Sniper Plates also looks good. Just as said, trim a little bit more of the return edge.
Looks great, you are on a good way! Keep on going.
Trim the overlaps an make it fit to your Body. That way it looks much cleaner.
For me, I had to add some side pieces, to close the gap
Where you have your black line, that should be ok. You can allways trimm more, but wait till you finish the bucket. Try it on with the s-trim, then you will see if it works for you.
That was just the One I was going to say. I had the same Problem with my Shoulder Bells and added I a new Snap inside my shoulder Bell just off-center.
That worked just fine for me, and looks a lot better now!