First, find a paper mask you like. There are lots of options available online.
Next, get some felt, black organdy (see-through) ribbon, sharpie, scissors, and a glue gun, then follow the pictures below.
Well, this picture looks a little strange. Glue the organdy ribbon over each eye hole. Add layers until you get a good level of opacity. I used three layers.
Glue the other layer of felt on top of this.
Attach elastic or ribbon. I chose to attach some white ribbon using hot glue.
You can glue some felt on top of this to strengthen it and make it more comfortable on your face.
Use a sharpie or some fabric paint to draw in the details and complete the look.