I think the mouth matters most. You can take away the eyes, ears but you'll always need your mouth. It's more important than your nose because you feed with it, and you can kiss with it too.
I don't think there's any one important facial feature. They all add to the beauty of the face. The shape of the face, nose and mouth are very important. The forehead can't be too long or it looks odd. Facial features go together to give the entire appearance of the person. I would say the shape of the face is very important though. The nose is always important, and the mouth is important, too.
But besides that I like green eyes and red hair
How it looks isn't very important, but its actions are extremely important.
Don