Harmony in my Chess
The biggest thing I've taken away from my game on the Black side of a Sicilian Richter Rauzer is being aware of harmony in my game. I recently gave a talk on Smyslov, and the underlying theme was harmony.
My 26th move Ra4 lacks any piece harmony after 27. b3 Ra3.
This is exactly what I want to improve on in my play. A logical force of play where my pieces are working as a unit ... and to stamp out examples of disharmony.