Thank you all for your overwhelming reactions. It's just paper scratch.
3rdJerseyman and donfarr: Thank you for your generous advice. However, we never planned this book to be printed and published. As a matter of facts we did order a few dozens of hard copies of the booklet, just to serve as presents for family and friends. People order such one time books at companies to see their holiday pictures in print.
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Does that mean we will put it on the market after all? No, the printing costs are relatively high and will at least be doubled by postage and packing. Even if there is a small fee in it for the makers, it still is too expensive for an occasional purchase and it will bring a lot of work for us. We can spend our time in a more useful way.
So we just publish it online and hope people to enjoy it.
We even go further than that. We have sent people the digital file of the picture of their choice and many have printed them on perspex to hang on their walls. Here is one in my own house:
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Thank you all for your positive feedback!