A few pages of bird skull studies. These are done from photos reference in a book of mine called
Skulls: An Exploration of Alan Dudley's Curious Collection. It's probably one of my favorite animal anatomy books.
Cachet Earthbound Recycled Sketchbook Paper
Copic Warm Grey Sketch Markers: C1, C3, C5, C7
Copic Multi Liners: 03, 07
White Gelly Roll Gel Pen
White Prismacolor Colored Pencil