Create a respectful and devotional visual representation of the Christian concept of forgiveness, embodying the essence of Matthew 6:14-15, without including any textual elements. The artwork should depict an act of forgiving and the subsequent divine grace, as interpreted from the biblical passage. Contextualize the scene in an ethereal setting that symbolizes the 'heavenly Father'. This representation must be in the medium of watercolor, capturing the various shades and dynamic flow of colors to convey the emotional depth of the biblical concept.