Watermarking images is a highly recommend method for preventing image theft. It is also very quick and simple to do using Photoshop or any other image editing software. Here is an example of an image with a subtle watermark.
Another option is to use a soft light blend mode like shown here, this gives a slightly different look to the one above and is nearly as subtle and just as difficult to remove. Either option is equally as acceptable on an image preview and both ways will help to prevent image theft for you. Your images can still be viewed and people may still download them but everytime they look at them, or show them to others your watermark can act as an advert for you.
Of course your watermark doesn’t have to be text based, it can be an image if you prefer, maybe a variation of your logo, as long as it identifies the image as one of yours. Experiment until you are happy with the look of your watermark on the image. Sometimes if your image is very pale you may need to try using black text or a dark image as a watermark though I still recommend making it quite faint so as not to distract too much from the beautiful artwork you spent hours creating!
Watermarking images provides great peace of mind for any artist wanting to publish their art on the web. We have other articles on image security online coming soon which we hope you will find useful in the fight against image theft! How to watermark pictures.