Im soo sorry it took me forever to get back to you on how to edit an eye using gimp. This is the first time i check my stuff in awhile. If you still need help message me.
The pages of the book box are made using a type of cardboard called corrugated or wrinkled, you can buy it from paper stores or make some yourself by peeling the upper layer of any cardboard box, leaving the wavy layer exposed. Then you paste it onto the sides of your wooden box, paint it and achieve the page effect... hope that helps!
<3, MADDZ SCNGRL