Realistic portrait

i rarely post realism on social media its not my kind of thing , but one must practice and study realism in order to learn more about art and improve right?

here i have used a grey toned sketchbook that i have bought this week , it was my first experience on it as well as using a white charcoal for highlights and i can say that i really enjoyed this new experience and learned a LOT

however , i don't know the woman nor the photographer , i found her photo on pinterest and took as a reference study , so if anyone knows i would add a credit at least