Start experimenting with inflatable materials. Since the balloon materials hasn't arrived yet, I first tried with a big plastic bag.
I like the semi-transparent visual quality of it, and it looks pretty light-weighted. The air bag covers your nose and mouth implies an association with breathe, and ironically it makes it harder to breath because the bag would covers your lower face tightly when you try to breath in and out. I think this form and material create a correlation between the transparency of speech and the suffocating feeling when you're not able to speak up or express yourself freely.
In the technical aspect, the front of the beak is still too heavy that it flaps down like a beard. I'm thinking maybe a harder material would be strong enough to hold the structure up. Or inflating it with helium could fix the problem.