If you accidentally watermarked your original picture and ruined it, there is a way to remove the watermark from it. You SHOULD NEVER REMOVE a watermark from a picture that does not belong to you. IT IS AGAINST THE LAW! this only applies to pictures that legally belong to you. Sometimes you goof off and ruin your artwork and you should only use this tutorial to correct that mistake. I DO NOT condone removing watermarks with the idea of stealing someone else's work.

Open the picture you want to remove the watermark from and select the Clone Stamp Tool.

Zoom in to watermark and then choose the Clone Stamp Tool. Control-click an area around the object or thing you want to remove. The color that you control-clicked will replace the watermark so you have Select several times as you go from one place to another to get the right shade of color.

This work will take time so that you can get a great result. Some watermarks are more difficult to remove than others.