Mad Hatter Prismacolor Colored Pencil Drawing

I am just fascinated by this Prismacolor Pencils Drawing of Johnny Depp as the Mad Hatter by artist, jardc87. Watch closely to see how she begins with just a sketch and builds the drawing using light to dark layering.  Notice, the white areas, such as the eyelashes are really negative space.  She is also careful not to smudge her drawing by using a barrier to protect areas where her hand passes.