I love these multi-tonal shapes provided by CupO'Doodle (http://cupodoodle.blogspot.co.uk/). I saw a couple of birds in it straight away and after working away at it I came up up with this character. For the original shape and overlay image please see my blog - http://scottysketches.blogspot.co.uk/2012/07/cup-o-doodle-birdman.html