Sunday Sketch on toned paper

This is my delayed Sunday sketch on toned paper, I'm trying to make one each week to practice my values and drawing skills. This is a sketch of more or less 45 mins of Miss Selina Kyle from Gotham series.

It was done on Clairefontaine Paint On Multi-Techniques Naturel paper, with a Cretacolor Negro Pencil and a white charcoal pencil (from koh-i-noor) for the highlights. I really like the effect and I will definitely be using this style for future portaits.