There is lots of information about the Albert Dock, as well as the other docks in Liverpool, online.
Wikipedia tells you this:
We liked the colourful artwork showing an imaginary landscape. This means that the buildings were overlaid so that they do not appear in their actual position as they would do in the city.
Some of Liverpool's beautiful buildings.
These are some of the pieces of artwork we took inspiration from.
For our final piece of artwork each member of the class chose a building to draw. We then put these together to make an imaginary landscape collage.