I have had hard time trying to find the difference between a musical expression and an adorno. Both are part of the follower's musicality and so far the degree of independence of the movement is the most clear difference I have found. For adornos a follower takes own initiatives based on music and the time available. One of the most frequent adornos are the small kicks done every now and then. Another possibility is the marking with the toes on music.
Noelia is following fantastically the piano here!
The followers can find a lot of ways, when carrying out the lead and they have a lot of space to find a personal way to take the steps according to her personal musical taste.
Here you have one of Juana's! That planeo is fantastic!
But there is a beautiful area in between these two, where the follower just adds something extra to the lead.
Watch this, when Juana takes the step and goes down following the piano.
Or this one from Noelia when she divides the step to a series of steps; first slowly and then with two markings!