There's something odd about the position of the added ruin model. I don't get a sense of it's position (is it in front of, behind or beside her?) You might want to adjust the texture on the ruin to come closer to what's on the hdr image. Otherwise, yes, I think that ruin model works pretty well.

And I hear you about faces on the bathroom wall. The previous owner of my house tried to get artistic with a trowel in our bathroom. All kinds of interesting shapes in there. And if you look at them from a different angle you get a whole new image.