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.
Kindly share your thoughts as comments below, I'll be glad to read and reply them all. Thanks.