Marc and GLuijk,
the exposure of the middle one, #1201 is ok; shutter 1/80. However, the illumination is not even, particularly in the bottom row, and there was some reflection on the last two patches. I see a pearly structure here too; GLuijk thinks that it comes from the reflection, but I am not sure if that is so.
Can you print it semi-glossy/satin, and on thick paper? One of the reasons of the pearliness is, that the paper is thin and its structure becomes visible. Hold the paper (not printed on) towards the light; is the structure visible?