These fine pen illustrations are by Chrysa Koukoura, she works purely in black and white and uses fine pen on paper. With a slight hesitancy in working with colour, I use fine pen on paper with meticulous detail, my aim being to draw the viewer in for a closer look. 
I love the simplicity and the restrictiveness of working in black and white, as it requires me to bring something extra out of an image that wouldn’t usually be there had a colour been involved.

Via: Chrysa Koukoura