I am currently attending to my second semester at the moment and today I'll be having my anatomical drawing exam today, I am still waiting for some hours before the exam starts.
I made the study sketch above this morning while I was preparing to go sit for my first paper and the drawing was quite straightforward for me. I did my quick sketch under 5 mins and then located my source of light, and I finished the whole process too by shading although the middle tones and the darkest tones.
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Kindly share your thoughts as comments below, I'll be glad to read and reply them all. Thanks.