Hypothetically, I'd say paler than people in that region as he was the son of God and not Joseph or somebody else (;-)), brown eyes as Mary would have had brown eyes, dark hair like his mother (had he been blonde or red haired somebody wolud have mentioned that in an epistle surely!) quite muscular as he'd have trained to be a carpenter like his father before he went into the ministry in the desert and as he did a lot of walking and lifting of children would have been quite thin and fit. I've often wondered why some renaissance painters paint a rather pathetic, weak man had it been the case, when he was flogged he would have died. All hypothetical as I say.