Tutorial: How to Draw an Eye from the Side http://rapidfireart.com/2016/03/23/how-to-draw-eyes-from-the-side/:
brick wall sketch - Google Search
Through drawing on train tickes I wanted to connect the offical documention with the regular people I see on my commute to college.
Build geometric shapes on top of a sketch. Apply a different material in each section. You could recycle a pen or pencil observational study to do this.
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alice tait, homing pigeons