This one is certainly not my most "pretty", but it's without a doubt my most ambitious.
To make a realistic Homer is just, impossible.
Matt Groening made him, voluntarily, a monster. He's yellow, he has a neanderthal forehead, big bulging eyes with (and i think it's intentional, so i kept it) a clear strabismus. A weird jaw bone, nose etc... Really little ears, really low on the neck, no eyebrow... His baldness is just too prononced for his age and all...
You can make him like someone else, trying to find his personality, or you can (i chosed that possibility, obviously) try to make him the monster he is.
That's just what i like to do, for now 4 years. I study the facial features of symbolized character, to see what can be taken from it !
This one may seem reeeeeeeeeeaaal weird, but i'm kind of happy with my work. it took dozen of hours to find the good balance, and i think it's the most precise rendition that can be find of him, even if the guy would be creepy in the reality^^