Drawings associate with Opera House

These are some drawings from other artists I think are in relation to Sydney Opera House. The first drawing is from Jorn Utzon, the architect of the Opera House. Because he likes the sea when his childhood, he build the Opera House in the shape of a sea shell. These drawings have a good trasition of tones and rendering.
Architect: Jorn Utzon
Artist: Paull Schlereth
Artist: Vicky Earle

Artist: Brett Whiteley