Answer:
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
What is eaten but not grown and was born in water but will disappear if soaked?
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
What looks back but cannot see?
What letter comes next: O T T F F S S ?
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?