On #7 and 8, can you change the purple to blue so we can see that combination? On #7 and #8, what if the arc or ring was behind the book in the right foreground and the upper end of the circle went across the top of the pages - sort of the reverse of what you have already done. That might bring forward the idea of the bridge more. I like that the book is open more to the left on #4 but don't like the checkmark (looks like a voting ballot) or the line separating the text and the image. Great job on all of your designs though - thanks!
Thanks for the changes and different options. I like it very much - stay tuned as I hope to have input from others today and they may have suggestions for tweaks.
Based on comments from others, they would like to see the circle or ring be a more "bridge" like element. Also, I think it would help if it were in a different color - maybe it should be blue and the book all in green. Ffinally, they would like to see the desing in more of a kelly green than the lime green (or at least have the kelly green be the dominant color).
On #51, what if you made the ring wider where it crosses the middle of the book and put a stick figure walking across the band (headed to the right side of the image).