Casts made of face, on the cast sculpt a beak then tape up the sculpt. Cut the tape into pattern pieces and transfer to paper. Tweaked the pattern and then cut out the pieces (leather). Tie together with leather lace, then mould the leather to the shape of your face. Can be painted with acrylic paints to give it that rustic look and fill wide gaps around the eye/lenses with clay.
Original: Plague Doctor Mask by Zwid