Helmet Video
The main part of the helmet is just three drawn curves and a couple of image maps.
Here are the drawn curves:
The helmet was improved using a transparency image to hide the bottom of the model (leaving the curved shape of the ear guard) and to cut out the air holes. I used Project Dogwaffle to make a TGA with an alpha channel for this.
Then a curvy map was painted to add the small surface shapes and rim.
The face guard is just several drawn lines. The plastic clips on the guard are extruded images (Curvy 2.0 only).