This link is silly but some mirrored film pulled tight between some thin black craft foam that has the mask itself you should get the iconic eye shape look I think. Have you hit up YouTube for some "how to make a Spiderman mask"? It may take a few videos before you fine the one you like.
Also buy more materials then you need and accept the first try or two won't look so great. I had to remake a lot of stuff before it looked kinda OK but I also suck at crafting things.