https://youtu.be/oVkxBwcl7_o This is actually the forth in a drawing series of hands, feet, eyes, mouths, ears, and noses. They are a fairly quick overview/study of each topic.
Everyone loves to draw eyes
https://youtu.be/goQzAN7tlFA This is an under 30-minute tutorial on the basics of drawing eyes.
RUSTY NELSON 