Now duplicate the top layer and the mask and add a little noise, then make the Layer Effect screen. Reduce the opacity on this level to where you feel it looks good and then add to your layer mask to hide additional areas. You are trying to get a balanced overall feel here and remove any shadows.
Now save a working version and flatten your image. Duplicate your base layer again, then save your file with a different name. Next, use the previously created rough clipping path as a base for a mask to hide the background. Obviously hide the background layer to make this easier.
Expand the canvas size to your desired size and orientation, and then create a new layer just above the background. You may also want to create one below this and fill it with white to help you see what you’re doing.