Imho, as an Italian, n° 1-2-6-8.
Northern Italians look surely more central european than middle eastern.
Southern Italians too. Southern Italians are dark, but that doesn't mean that they look like Middle Eastern. I think they are a good mix, but since the dark ones look more like Greek/Balkan people while the light ones really look like Northern Italians. No difference for me. My father comes from South Italy and I really look more central european than middle eastern!
Number 3, no for obvious reasons.
Number 4, is the opposite of number 2.
I think that Northern italians don't look "Celtic" at all. They can look Mittle-European in many cases, but they don't have "Celtic" features (if this means something). But this is always my opinion as a NON-expert.
Southern italians of course have a majority of Greek look!
Northern Italy for me is Southern Europe. As Catalunia, Provence, etc. That doesn't mean that Milan is like Athens or that Lombardia is like Sicily, but still South of Europe. Milan and Roma are different, but still closer than Milan and Berlin or Paris.
Number 8 as explained above!
Southern italy is not Middle Eastern, but Northern Mediterranean I think. It's really different.