In order to become a better Photoshop user you need to speed up your workflow and become efficient in order to concentrate more on the design part rather than on dealing with the menus.
This tutorial will show you how you can quickly select a layer from the canvas itself, how to pass layers from a document to another and how to align elements on the canvas without using the guides.
Before starting to work on an image composition, you need to know if the stock images that you have fit in terms of light, angle etc. Using the layer styles window you can change the blending behaviour of the image and remove white and black backgrounds non-destructively. See how quick this is.
More Photoshop tips and tutorials: http://www.psdbox.com
Learn a quick way of reapplying a filter using a simple shortcut and also how to apply an alternative sharpening to you images.