Since this still has the possibility of getting in this year's Halloween update, let me give some feedback:

The masks should use some more rivets, like around the whole head rather than just the beak. The rivets look more like bolts (and they make it look more like a Robotic Boogalo version of a plague doctor mask), shrink them down and round them out just a bit more. The filter should definitely be redesigned, the square holes are too flat and could be replaced with like a small cage or vent-lines. The paint region only being the metal plate on the beak doesn't look that great, maybe change that to the eyes or change it to the rivets (if you plan on adding more of them).

Overall this is a good idea, it just needs some more work.

I still need this in my life

I've always wanted this kind of mask for the pyro, but look at the one that the medic has, your beak is waaaaayyy too high, some little changes and corrections and this would be a dope mask

Love the idea, but the beak is way too high. Think it's the main thing that kills this cosmetic off for me

Not bad, but I think the textures are a bit soft, softer than TF2's textures usually are

cool concept, beak is slightly too high up though

it looks like a mosquito but I dig it

VALVE ADD THIS TO THE GAME AND IM YOURS

This is so cool i love it aaaaaah

surprised this hadn't been done sooner

Textures seem a little flat, especially on the rebreather. Gives it a look that's a bit too cartoony. Also get rid of the paint region, there's absolutely not need for it. Otherwise, I like it.

Pyro would never wear a mask. No.

agreed with the guy below, why would pyro wear a doctor's mask? He doesn't have any particular characteristics that could relate her to one.

Pyro's not a doctor

I get it's supposed to be a plague doctor mask, but it just looks like Pyro has a big-fat nose under his mask.

Wasn't there already a workshop plague mask with the exact same name?

This almost works as is ... just why with the Paint Region on the nose?
It feels like it would work a lot better for more paints if it were to be on either the eyes and/or the filters (side bits) of the mask.

Outside of darker paints, it just stands out in a very strange way that looks out of place for formal loadouts.

If the region has to be in that particular spot - I'd recommend either darkening some of the other paints (see the Tuxedo Royale's Stirred Style) or apply another text on top of it (see the Impact Impaler) to reduce the brightness of some of the more questionable paints.

Other than that, I like the idea of a Plague Mask on Pyro, and wouldn't mind seeing it this Scream Fortress.