A quick comparison

On my flight back home I made the traditional sketch on the plane.

Those are always hit or miss for me, but this time I think I pinned the perspective down quite well, actually.

My method was a mixture of the susual instinctive sketching and what I learned in Civita. Can you spot the vanishing point?

Slightly curved perspective even!

As a comparison, here is the sketch I did on the flight to Rome.

Just winging it

There is always room for improvement, but I think I got a bit better.