Jacob’s Well, Wimberley, Texas is a perpetual artesian spring considered one of the longest underwater caves in the state. It is the main source for Cypress Creek, which forms the Blue Hole swimming area downstream & flows into the Blanco River. The mouth of the spring descends 30ft to a series of underwater chambers.
This would be an example of composition because the tree is coming in from the left and the horizon is not cutting the picture in half. Space is also filled with things like the clouds underneath to make the picture look more appealing and complete.