The windmill is a symbol of the Australian outback. It provides life-giving water for the stock. Without the water there would be no stock to take to market and there would be no need for the huge road trains which are the Kings of the road as they roar past.
As the sun sets it silhouettes the delicate tracery of the trees along the river bank.
Photography is all about experimenting with light, and then positioning yourself (or your subject) in the right spot to achieve a certain effect. One such effect is a silhouette, in which an outline of someone or something appears dark against a lighter background. Silhouettes can be very dramatic and resemble black shapes without any details, but the effect varies from picture to picture.