These all look really good, my only critique is that the vanishing points on your two-point perspective assignment are a bit too close. The building in the center looks kind of distorted, the other buildings look good though.
Those eyes are pretty good! Since it appears we're naming our favorites, I'd say for me it's either 2 or 5. I think you really nailed the volumes and angle on 5.
I think 1st and 3rd turned out the best. 4th would be great too, except for how the teeth read. I really like how teeth turned out on the 3rd one. It's just a few brush strokes, but they have so much volume!