I had a young boy I was teaching to draw, when Valentine’s day was coming around I was trying to think of a subject that would fit the holiday, but not be too juvenile. So I decided we would draw the human heart. He loved the idea and did a great job. His mom is a nurse and he thought it would be the perfect Valentine for her. What brought this all to mind was this website I found where they are doing a swap for a Valentine using a drawing of the human heart. Check it out at Swap-Bot.