I did this to myself. I know from experience that high contrast images with large shadow spaces make good stencil art and those comprised of thin lineart not so much. Also, it's obviously less of a pain to cut by hand.
But, I have determined that this is exactly what the last of the [Baker Institute] murals needs so it is exactly what I'm going to do; a large image that you can sort of make out from a distance but one that doesn't at all take away from all the layers of other content on the surface. This will make up the final addition to the wall, and after that it's just a matter of final touch ups here and there.
Oh wait, and some ceramic tiles :–)