What are the key principles of the Aesthetic Argument?

The Aesthetic Argument bases its premise on the idea that the universe is ordered. The abundance of unnecessary beauty which is not needed to sustain humans but is simply there is explained by a creator God. An all-loving God therefore could create such beauty out of love for the people inhabiting his creation. 

There is both natural and human beauty; natural beauty such as stars, waterfalls, sunsets and then human beauty such as the ability to create music and art.