Please generate an image depicting the essence of the bible verse Mark 13:28-37. The scene should be interpreted in a devotional and respectful to Christianity manner, communicated through the medium of watercolor. No texts or words should appear in the image. For context, this scripture passage revolves around themes of watchfulness and the return of Jesus, so elements that might symbolize these themes, such as a fig tree, an ancient clock or thoughtful, prayerful people could be incorporated in the visual representation.