Post-Processing photographs in Photoshop is all about experimenting and finding what appeals to you. JHP have made a several concise sets of Photoshop Actions for you to fuel that creativity and save time when working to a deadline.
JHP Photoshop Actions - Review
Watermarks are sometimes very annoying especially if large and so distracting that it draws the view away never to return. I’ll help you make a watermark basic enough to not discourage your audience yet ugly enough to stop takers. If you are using GIMP checkout the tutorial here: scottphotographics.com/how-to-make-a-simple-watermark-in-gimp!
How to make a basic watermark in Photoshop