Wow, that's a tremendous help! It always bothered me how the first, rough grayscale version looked more like me than the final. I was so focused on getting a smooth look with the palette and placement of pixels that I sort of filled in the likeness with my imagination instead of looking closely at the reference. Another funny thing is how the final is too tall and thin. When I draw for fun (I often draw cartoon-like) I draw my characters this way; longer exaggerated face, larger lips, bulbous nose... it sort of bled into my self portrait.
It's reassuring to see I wasn't too far off when it came to eye, nose, mouth, etc. placements but at the same time unsettling that I truly could not see the differences between my picture and the final pixel. Interesting! So, thanks for the fresh set of eyes, Mathias, and as for the cropping... It's just a weird thing I do; an arbitrary, forced restriction. It looks to be a habit I should break.
Rough edit: old vs. new
Eyes are still a bit droopy among other things (actually, that whole area is still funky), but I'm glad it's turning out better. I worked from Mathias' file so the colors changed a tad (although it's tough to tell on an iMac lcd monitor)? Ah well, if anything they look better.