Looking at the capture of it in Robservations, I don't see all the blood that I remember. I don't know if it's that my memory is wrong or if the capture subdues the red.
All that was ever shown in Ep #844 were those three streams of blood running down the portrait's face:
(http://www.dsboards.com/epimgs/0844-3.jpg)
;) Though at one point the first and second merged into one and third became a trickle as I suppose we could say the portrait "healed" (though in reality it was probably because they ran out of "blood." :D):
(http://www.dsboards.com/images/0844-2.jpg)