Photoshop allows the user to create images that otherwise would not be possible. Once the the basic skills have been learned the only limit is the user's imagination. This can range from basic enhancements like contrast, brightness, colour saturation and so on (all possible in Lightroom) to to using layers for placing other images into your picture (not possible in Lightroom), known as compositing.
Many of the images that have won in the club's Charlie Williams Trophy monthly competition (and others in main club comps) have been composited and even in external competitions have done well. Not all of course are made this way but creating something new is fun and can be very addictive.
If you want to do more with your images, Photoshop is a tool that is a must for beginners, and all the way up to the top professional. This special interest group can guide and help you achieve what you never thought possible!