This sketch was completed in two sessions, in the morning enroute to the Venice Architecture Biennale and then finished in the late afternoon. It is a view taken from the Riva Degli Schiavoni looking towards the island of San Giorgio. You can see glimpses of sunset through the bridge, which I've tried to capture in the sketch. The light faded fast and I could have done with more painting time before dusk! It seems a little unfinished.
Here is a photograph and the sketch taken from approximately the same viewpoint.