/cgl/ - Cosplay & EGL

Woo, I really need help with my armor for Sumia (see pic). I'm working with Worbla (have about half of a jumbo roll left, should be enough for both arms if I guesstimated right), but I also have tons and tons of craft foam or can run to a craft store and get more stuff if really necessary.

Anyway, so far I have just the chestplate. It's not perfect, but for the level I'm at I think it's decent, and will look much nicer when painted. I think I can navigate myself through the fingers and gauntlets fairly easily, they're not tough stuff... but the SHOULDERS, I'm sorta stumped on. For the shoulders, I can't figure out how I can make that shape 'neatly' in Worbla. is there something common that I can form it over to make it accurate?