With a high quality digital camera, a steady hand, and a keen eye you can capture some truly amazing photographs of nature at its most beautiful.   But what happens when you can't find a suitable scene to photograph, or it's not quite suitable for your exact purpose?  Well, this is where Photoshop can help.   This tutorial details an easy method for creating realistic water droplets that can be added to any image.  All you need is Photoshop, an underlying picture, and a sense of realistic perspective.   Interested?  Read on...