It's Step 2 of a work-in-progress. This stage is called a Tonality Test, which is a light and dark study, done in monochromatic value. Still in-progress, as I continue to define light and shadow. This is the first step to making a full-color digital image. The program I'm using for this one is called GIMP, and it's FREE. Go HERE: 
Based on my fan-fic snippet The Night Before we Say Goodbye. Link and his twin sister Lydia.
The characters are expanded on further in my short story A Family Reunion.
The original sketch for this is here: NBwSG: Pencil Sketch