Use acrylic sheet, fine-sanded on one side so it's a frosted surface. Orange LEDs pointing in from the edges of the acrylic will light up the frosted sections.
Cut out sections from the chrome mask for the shapes of the glowing parts. Cut out sections of acrylic that are slightly larger than those mask cutouts, so the acrylic can be mounted to the inside of the chrome mask.
The acrylic can be relatively easily heat-formed with a heat gun to fit the curvature of the mask. It won't do very deep compound curves well, but you should be able to get small pieces to fit the mask easily.
Something like this to give the glow. For your purpose, lights with a directional glow will be better than the 360-degree output, but I didn't search very hard for that.
You can get acrylic from the hardware store or art supply store. You don't have to cut it to that jagged-teeth shape - that'll be very difficult. Instead, use a long rectangle of acrylic and paint or electrical tape to mask off the shape you want.
Here's an Instructables with a similar concept, though instead of cutting things to shape and frosting the whole shape, they keep the whole sheet and only frost the section that they want to glow.
IMPORTANT: Design the mask so that the glowing eyes are not right in front of your own eyes. Make it so they're slightly lower and farther apart than your own eyes. If they're right in front of your eyes, you won't be able to see out the mask.