We got 4 masks this season, that a lot, but I think only 1 (or 2 after some changes) are fit to be masks.
First we should define what a mask is. I believe a mask should be defined as a face covering cosmetic that can't be categorized as an eyepatch, beard or hat; they should allow players to wear hats with them, unless the hat is a face covering one. Now I'll go over every mask added this season and give suggestions for potential changes.
Thieving Mask of Mischief - this is the only one I don't have any issues with.
Monstrous Mask of Mayhem - this one should be a beard instead of a mask, to keep consistency with the Midnight Blades mask, would also allow players to wear other masks with it.
Shadow Tide Ninja Mask - for this one I have 2 potential changes, either reclassify it as a face covering hat, or allow players to wear hats with it. I can assure you no one would be mad about the potential clipping, it's always better to give more customization.
Shadow Tide Fox Mask - this one is straight up just a hat, face covering but a hat either way.