I have been trying to get a deep normal map for a wall texture, like the image seen below. However even after numerous attempts, useing blurs, makeing the image greyscale and changeing the lighting I have been unable to make my wall as deep, I have duplicated the depth map of the normal lowered the detail map however the wall seems to always stay flat.
I understand that my wall texture has been created from a very neat wall however I have used other wall textures and still aquired the same result.