Well they didnt always wear there trademark helmets pr first album time. Heres a snippet from wikipedia;
"Daft Punk have said that they donned their robot masks to easily merge the characteristics of humans and machines. However, they later stated that the costumes were initially the result of shyness. "But then it became exciting from the audiences' point of view. It's the idea of being an average guy with some kind of superpower."
Pencils, white marker, and a hell load of silver pen, its a shame silver becomes matt when scanned in though its actually really shiny. I also photoshopped some of the glare effect to and overall gave it clean up.