I use Arches 140lb Watercolor Paper Block, Cold Press. Its over $60 for 20 sheets.
This paper holds paint and water without warping, better than anything I've ever used.
It's important to lighten the pencil lines as some of the colour will be semi-transparent when used with water and the lines can show through.
I use PrismaColor Kneaded Rubber
I snap off a piece and roll it into a cylinder. It molds just like silly puddy--its fun!
Then I roll the cylinder lightly over the pencils with the palm of my hand. This lightens without erasing all together.
wash your hands and dry them thoroughly before doing this. There will always be oils on the skin of your palms, but the less the better. Remember, if you are using a water based paint like gouache, it can be disrupted by a greasy surface.
Now I mask with this.
Just scotch masking tape.
The cheap stuff works just fine and it never tears the Arches paper. (it has been known to tear some of the cheaper bristol board I've used, however. So be careful).
I paint with gouache, generally and though I use many brands, I usually prefer either Winsor & Newton or the Royal Talens Art Creation line.
The colours I'll be using will be:
Azure Blue (Royal Talens)
Prussian Blue (Royal Talens)
Yellow Ochre (Winsor & Newton)
Lemon Yellow (Royal Talens)
Chinese Orange (Winsor & Newton)
Spectrum Red (Winsor & Newton)
Cadmium Red Deep (Winsor & Newton)
Burnt Sienna (Royal Talens)
Zinc White (Holbein)
Jet Black (Holbein)
The brushes I'll be using are:
#8 round sable hair brush
#10 round sable hair brush
Then as always, I start with the background.
Then I establish the lighting I want by filling in the shadows with black.
Once the shadows are established and I have a consistent light source nailed down --
I start in with the Zorn skull mask. I love painting metals.
I start by painting a red base for the cape using Cadmium Red Deep (Winsor & Newton)
After the base red is established with shadow and highlights, I coat it with a semi translucent blue colour after the red is dry. I use Prussian Blue (Royal Talens). It allow the red with its shadows and highlights to show through and gives the fabric and metal a purple hue.
Now I start in with the red using a combination of Spectrum Red (Winsor & Newton) and Cadmium Red Deep (Winsor & Newton)
Cyclop's Visor is painted in with Spectrum Red (Winsor & Newton) for the Ruby Quartz part and the gold is done with Yellow Ochre (Winsor & Newton), Lemon Yellow (Royal Talens). Chinese Orange (Winsor & Newton) and Burnt Sienna (Royal Talens)
The masking is removed
then its scanned in so you can see a more accurate representation of the colour.