Love the trip pick, looks like something I'd do. Didn't lego make some translucent black visors? I think I have one or two, that could work if you were desperate haha, but to be honest the double coloured arms I think works well. I think it would've been cool to pull the Sandtrooper one arm look, but I think overall it looks better, and you need your army to look good, not just kill well
Great army though, I really need to starting building one of my own for my evil dude (sigfig) I could cheap out and use Stormies/Clormies, but I would be cool to have another army for some intense cross-theme fighting