Edit #1 on Retopo

Apparently symmetry DOES matter... It took me quite a long time to understand that and I had to abandon my old retopo and start a new one... and I don't even have the luxury to take a break, not to mention starting again...

Also, on a personal note, if you are having problem with symmetry not being...well, symmetrical, try exporting ONLY the head as an obj, then fixing it from the 'Transform' menu and THEN starting the retopo!