I am very concerned for you. The painting has not caused your depression, but it does show a sad child. Take the painting down, give it to charity, then forget about it. Replace the painting with a beautiful, happy image, something that makes you feel good. Please make sure that you see a doctor or at least phone a friend. We all have dark times, but there is always a light at the end of the tunnel. I am sending you my very best wishes and hope and pray you feel better very soon.