Very creative interpretation of the challenge - and well done! The top seems a bit dark to me - seems to unbalance the picture as a whole. Perhaps more of the corner of the karma sutra being lit, or just more light on the top would help it.
Very good title for a good idea. Probably the best idea in the challange. The composition bothers me though, allso the page out of the bigger book. Did you try laying the maller book on top of the bigger one and have the lighting so the size is visible.
LOL The make "Sex for Dummies" in a pocket size. Bet that would help out many budding relationships. Great idea. The black shadow running along the binding of the Kama Sutra book is a little distracting... otherwise an 8.