I sketched “Excelsior” which was moored in Lowestoft Heritage Quay.
She is a former fishing smack, built 1921, now a training vessel based at Lowestoft.

The water was very muddy because a dredger was at work in the river channel, providing education and entertainment to those on the jetty.
It took me 1 hour 15 minutes to draw Excelsior. I was sitting on the concrete, facing away from the dredger entertainment and looking at Excelsior through a fence.
Here is work in progress.