This is practice with graphite. Just different grades of graphite pencils make the shift from the palest gray to the deep black shade.
It is the darks and lights, at the right time and place, that make a drawing rich and meaningful. It is the experiences of the highs and lows in life that bring meaning to our life, too. If it is all sunshine and life is easy, we begin to forget how special those sun rays are and how the highlights make the flowers stand out. When everything is heavy and dark and sad, we can lose our way in the shadows.
If this is a season of light, bright, pleasantness for you, enjoy it and share it with others. Make memories. Thank God for it.
If this is a season of dark, dull, sadness, remember God is with you and will guide you. He promised He would never leave you or forsake you. (Deut. 31:8) This time will end and you will have treasures from the darkness to share with others. (II Cor 1: 3-4)
Just as a graphite picture needs light and dark shades to give it realism, our lives also will have times of light and dark so we can be real in this world.