This is a poster of Big Ben by Roy Avis. The artist uses linear perspective very well. The horizon line is just about where the water meets the land, this is where all the buildings become apparent. And as you can see, the vanishing point is right next to tall tower. The buildings and bridge all go back to this one vanishing point, making the viewer naturally focus on the main purpose of this painting: Big Ben. The artist most likely used this technique on purpose to draw eyes to the focus and show space at the same time.

--Alexis Swoyer