Q: ralph waldo emerson http://i66.photobucket.com/albums/h254/ramosmark/emerson_0002.jpg
A: your drawing is really good,it takes time to master human face drawing.however 1.the tone is not well applied.ie,the shadows on the face should have been more darker. 2.there is no smoothness,there is no adequate merging between the dark and white. 3.there is poor definition on the overall drawing. i`ll advise you to look for examples in books and + a tip use tissue paper scrub it on a pen or charcoal or even dry pastel,you`ll see the results, it will give smoothness and merge the tones,