These appear to be raw covers, in which you can still see marginal annotations.
Claudio Villa, Angelo Stano, Bruno Brindisi, Corrado Roi, and Claudio Castellini are all artists who worked on this surreal, noirish, long-running Italian horror series.
I've read four of the 100-page books so far. An introduction, plus my thoughts are here.
These pieces were found at a nice Tumblr blog which covers BD, manga, and animation genres.