The theme is:

Nature Photography

Nature photography is photography that unlocks the beauty of natural elements in their natural habitat within a frame. It is an umbrella term that covers Nature Photography such as; landscape photography, wildlife photography, seascape photography, forest photography, cloudscape photography and astrophotography to name a few. The aspects of nature include a variety of subjects ranging from plants, animals, to a hidden natural wonder.

True Nature Photography is without the hand of man, in other words nothing man made (or human) should be in your image.