Aesthetic faces
The Aesthetic Faces 
command enables you to define faces with a high aesthetic requirement, that should be free from blemishes and visually appealing in your model. These faces display in green on the canvas.
Aesthetic faces display in green on the canvas.
To reduce the risk of visual defects on surfaces, follow these guidelines:
Avoid placing injection locations on aesthetic faces.
Avoid ribs or other features on the opposite side of aesthetic faces.
Avoid areas of high local thickness.