Can you match the tones in the photograph? This is an easy exercise, all you will need is a soft pencil. Allow yourself about 30 minutes and stop there even if the drawing is not finished.
Try not to be hard on yourself, after all, you are not doing a drawing for the royal family. See how lazy and casual I was with mine. Drawing is about meditating through the process and is supposed to be a form of relaxation! I love half finishing drawings too because it gives the viewer a chance to participate in the work. He has the chance to make up his mind about what is not shown. Many famous artists deliberately decide a work is finished when there is space left for contemplation.
To make it easy this time, you may want to lightly trace the main shapes first then lay the page alongside the photograph and copy the tones. The exercise is made simpler by using only 4 tones, light (the white of the paper), medium, dark and darkest.
It may help if you refer to the tonal bar from the previous post called “Drawing – Living in the Light.” http://zenschoolforcreatives.wordpress.com/category/learn-how-to-draw/
Build up the tones gradually paying particular attention to the hard and soft edges. Squinting helps to compare your drawing to the photograph.
Have fun with this and remember…your drawing is good enough despite what you may think!