Details. Musical analysis. Note grouping. The list goes on – there are literally thousands of details in a single piece of music. But we can’t forget the obvious.
What are the opening dynamic and tempo markings? What character do they suggest? When do the dynamics change? When does the texture of the music change?
The thing about composers is that they try to use every resource available to them to convey the emotional and musical detail they wish. To that end, even the simplest of characteristics is fair game.
Don’t forget the obvious. The broader aspects and the general feel of the piece are often the most important things.