Above is one of many sketches I've done of the One-Eyed Sailor as a real person. Given the exaggerated features of Popeye's face, it isn't easy to come up with normal looking features and still make it look like our spinach eating Hero.
This sketch is actually only about two inches in diameter, done with a mechanical pen. I was doodling on some tracing paper and came up with this sketch. As any Art Teacher will tell you, it's always important to experiment with and practice with any and all types of art supplies and mediums.
And like above, you might come up with something cool.