How is it a good idea to wear face paint instead of a mask when your acting as a crime fighter? It does not conceal his identity or provide any aid. Now a mask has a better chance of providing ID protection and offer cool features like night, x-ray, or thermo vision .
The mask he wears in the comics is pretty much the exact same thing as his face paint in the show.
They went realisticish with Arrow so fitting infared, nightvison, or other tech like that into a little domino mask is very not realistic. Makes me a little nervous to see how they'll handle Flash.