Quorra from TRON

I recently realized that one of the biggest challenges that I have in my art is that I am scared to use high contrast and make realy dark marks to create depth and visual interest in my drawings. I picked up a set of prismacolor cool grey art markers this week and I made it my goal to challenge myself to use them to break myself of that very bad habit. This drawing of the stunning Quorra from Tron Legacy (which has the most stunning art direction I have ever seen in a movie) was my first undertaking and I am really happy with it! I know there are still lots of things I need to improve on, but I feel like this is a big step forward. Critiques are always welcome!

Materials:
8.5" X 5.5" Bristol Board
3H pencil
Staedtler white eraser
Prismacolor cool grey art markers
Sakura Micron .5 tech pen
Sakura brush pen
Blick academic 2 round sable brush
speedball black india ink