Answer:
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
You cannot keep me until you have given me. What am I?
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
I am constantly overlooked by everyone but everyone has me. What am I?
I come out of the earth, I am sold in the market. The one who buys me cuts my tail, takes off my suit of silk, and weeps beside me when I am dead. What am I?
Keep doing me to avoid lens dryness