Here’s a technique I developed for quickly finessing a Layer Mask using the Dodge/Burn & Blur tools. The idea is to use the Burn Tool to bring the mask in tighter to the object and the Blur Tool to give the edge just the right amount of softness.

With a little practice you’ll find this method works very quickly because it does not require you to be as careful as you would need to be with the Brush Tool.

Take a look at the video and let me know what you think.