digital painting with photos

I was about to start another zbrush tutorial today when I saw one on using photos in digital painting.  This is something I have tried a few times with mixed results so I thought I would do this one first.  I am still roughing out my idea but I thought I would post what I have so far.  I am thinking I want it to be a castle by the water with crystals growing out of it.  I haven't decided where I want the castle yet though.