Copy the layer containing the book now and blur out the copy making use of a special filter: Filter - Blur - Gaussian Blur.



Decolorize now the blurred layer (Image - Adjustments - Desaturate (shift+ctrl+u)) and change this layer's type on Multiply.



Make the necessary corrections now including the brightness and the contrast of the layers with butterflies, making use of Image - Adjustments - Levels (ctrl+l). Merge down both these layers: Layer - Merge Down (ctrl+e).



We have now to create a mask of the butterflies' layers. It's possible to make it with Layer - Add Layer Mask - Reveal all. Apply after that the Gradient Tool to create the effect of the butterflies' coming out from the book's pages, hiding partially their edges.



Insert now on a new layer the picture of a third butterfly, the same with those two, but it's necessary for the third one to be pictured from above.



We'll make a printed picture out of this butterfly. First insert the butterfly on a book's page (Free Transform, Distort):



Then decolorize it and change the layer's type on Soft Light.



Correct the colors after that, selecting the option: Image - Adjustments - Curves (ctrl+m). Then use the Levels option (ctrl+l) to make corrections on the brightness and on the contrast. Minimize the layer's Opacity also till 85%.