The MRW isn't really too important, as I felt from the get-go that it was unlevel. Still, if the ground an aircraft sits on is sloping, it would naturally lead to the lines of the aircraft doing so too. There was a recent pre-screening thread where this was pointed out by Dana, and I fully agree. Take the runway at Lukla for example - you'd expect the aircraft to have a similar tilt in Photoshop to the example you've posted above (but much more pronounced obviously).
Going back to the Tunis, I really didn't want to go off individual aerials as they are too unreliable, however most of the verticals seemed uniform enough. One thing to bear in mind is that I level these from the full-sized images, and make sure to zoom in many times to check the exact angles. With this shot, the terminal actually leans ever-so-slightly to the left.
By the way, the re-levelled MRW Metro shot.....
I just don't want this to get rejected now with the comment, "Buildings all lean to the left".
Here's a re-hash of the Tunis. It does look better now but the terminal left side does lean to the left. Again, I don't want the next person screening it to now turn around and say, "You should have used the verticals".
[Edited 2012-04-26 15:03:09]