The straps are too thick, and too soft around the edges. Make them harder. Overall, you should lessen the amount of softness of edges as it's quite visible where they should be a bit tighter. Also, the oxygen container(or whatever it's called), should be wider, but it also seems a bit too long. Also, you seem to have alot of "seperate parts" For example, the thing that connects the oxygen supply should be part of the mask and shouldn't "pop out" like that.
I don't know how closely your following the ref but what stood out to me is these two proportions aren't matching too well in terms of thinkness or scale, but I don't know one thing about gas masks :P
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I don't know how closely your following the ref but what stood out to me is these two proportions aren't matching too well in terms of thinkness or scale, but I don't know one thing about gas masks :P