can you have a look at your latest *.dds post please and compare it with the original.
it's the detail of the wall concering me.
it looks not "deep" enough.
When i take a look at the original then i can see more depht between the stones and the concrete fixing the stones of the wall.
hard to find the right words, maybee its the color differences in the orig dds compared to yours.
Try to make a grey-scale bump map of your tex and the orig, i'm sure you'll find out that with the same values you'll get higher differences of the original.
i provide 2 pics, 1st is the original, 2nd your mod, have a look at them.
as you can see your tex is more "clean" a bit fabricated.
In fact the original is fabricated too but looks more real to me...