The idea is still a good one and while this wasn't finished to the point of using it as greeting, practicing with images from Stampin' Up were fun and this might just become something for my granddaughter to look at and play with. Here is the cover of this mini book that, with covers, could hold 8 images.
The trimmed paper, with the shorter side at the top of the score board, was scored at 3.75 inches. Rotate the paper to landscape view and score at 2.75", 5.5", and at 8.25"
The middle section of the paper needs to be cut as shown. I used my Stampin' Up paper cutter, inserting the blade at the 2.75" mark on the long score line and cutting down to the 8.25" mark. To be clear, I made that cut before using a bone folder to emphasize the scoring shown in the right side photo above.
Confused? Remember that the paper is slit along the horizontal score over the two middle panels. That slit allows you to pull the middle fold on the lower half into a valley fold while pushing the upper half into a mountain as you adhere the end panels into this configuration. The reason you did not apply tape to the third panels from the left on top and bottom is that the second panels that are taped are going to adhere to them in a moment.
Wow, what a lousy photo....but it shows what you have before folding the pages into a traditional book format.