Description: Portrait sketch of a person done in prismacolor pencils. Also an unfinished sketch but shows my process. In some areas I went too dark too soon, causing it to look a little muddy. The wax of prismacolor pencils build up causing it to be pretty hard to do anything to fix. A solution is to use a white eraser and erase as much as you can. It will not make the paper go white again but it will get rid of almost all the wax and allow you rework the surface again.