Here is a great PSD notebook mockup with a unique gravity-style design and a clear cover. You can improve the look of this mockup as a whole by adding your own graphics to both of its parts.
To change this sample:
1. Start Adobe Photoshop and open the PSD file.
Find the layer that has the notebook and the clear wrapper.
3. Double-click the layer to open the Smart Object.
4. Put your graphics into the Smart Object and save the changes.
5. Your new design will be added automatically to the mockup.