I created a portrait render of Black Widow from the movie The Avengers. Scarlett Johansson did a great job in her role as Black Widow and I wanted to make a portrait of her to show my appreciation of her work. I created this Illustration to also help me learn how to render people with Prismacolor Premier Grey Fine Point Markers.

Once I was satisfied with my render of Black Widow, I then brought the render of her into the program Procreate to add color, I used the multiply layer and painted underneath that layer to get the result shown above. 

This is the reference of Black Widow I used to make the portrait render. This image in particular is from the Movie The Avengers made by Disney's Marvel Studio.