Hi Monse,
thank you for an impressive output. I will comment on each design individually.
regarding #6 I really like the idea of showing multiple figures. The incorporation of the book is also really good.
regarding the book - I know it is a book, but one of my colleagues asked if it was a mobile phone. It needs to be less ambiguous. The USG - font should possibly be more rounded in on itself than away, maybe more organic. The color is good.
You seem to be on the right track. Thank you for responding.
Best
Klaus