Vector black and white illustration of human skull with a lower jaw in ink hand drawn style. - stock vector
Octopus skull sketch
Skull with smoke effect || realistic drawing by Eline Groeneveld
Drawing The Head, Drawing The Dead http://www.drawninblack.com/wp-content/uploads/2008/11/skull-william-miller-354px-plate_vb_human_skull_engraving_by_william_miller_after_drawing_by_w_miller.jpg
Intricate Paper Cut Art by Max Gartner
Create a series of studies of the same thing - vary the shade, colour, tone, media etc. for each.
gcse art coursework.
skull_sketches_1 by ksenolog.deviantart.com
Skull with vines growing through it. I don't know why but I love this kind of art..
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Flower eye skull... something similar to this (same colours, no blurred background)