If you work outdoors be passive, go with the weather. This may mean two hours sheltering from a downpour, followed by a wonderful burst of sunlight and a rainbow.
My technique, starting with a quick outline in pencil, is designed to record first impressions, with no time for second thoughts.
I try not to handle the foreign subjects with my English techniques and preconceptions, but to paint Sydney in Sydney and Tangier in Tangier.