The first couple of photos show the south-east corner of Canning Dock, photographed from either side of the entrance from Canning Half-Tide Basin; the curved quayside in the foreground of the second pic is the area next to the Pumphouse. The photos probably date from the early 50s, following the dismantling of the upper floors of the Customs House, which I think took place in 1947-8. (The basement walls were left in place for many years and the site was used as a car park during the 1950s.)
The third photo shows the north-east corner of George's Dock prior to the dock being drained and the construction of the Liver Building. The Overhead station visible is Pier Head Station; the tower to the right of St Nick's Church was known as the Telegraph Tower, and was part of the 19th-century Tower Buildings that preceded the current one.
