1st pass: These are the first clean lines, when he's really taking shape.
Refined: Mistakes ironed out. It's always a toss up between realistic drapery and showing some form. Abs would not be visible beneath a loose cloak, but I didn't want him being just a pile of crumpled material.
Tone: I add shadow first without colour, so that the colours do not distract me. My eyes are terrible and every little helps, especially with such a high contrast costume.
Colour: I then turn off tone and add colour, so I can see how the colours work on their own.
Final: Last additions, such as reflections, dust and extra equipment.