And the winner is...

About the masks:

After three weeks having been displayed on the wall of the corridor, the votes of the masks have been counted and the result has been as the following:

The mask 24 has earned 16 votes.
The mask 36 has earned 14 votes
The mask 19 has earned 6 votes
The mask 44 has earned 5 votes
The masks 25,27,37,40, and 41 have earned 4 votes each one.
the mask 30 has earned 3 votes
the masks 10, 18, 22, 34 and 39 have earned 2 votes  each one.
The masks 2,5,9,11,14,17,20,21,26,32,33,35,38,46,48,49 and 51 have earned 1 vote each one.
The rest have earned 0 votes.

Here there are some pictures of the recount.