In this tutorial I will teach you different ways to touch up your signatures, below is an example of a nice fixed signature:

First of all we will learn how to add a black stroke.

1. Click Select>>>All
2. Create a New Layer
3. Click Edit>>> Stroke
4. Select Black as the color and 1 as the size.
5. Click OK.

Now we will learn how to make a darkened tone.

1. Duplicate the sig.
2. Filter>>>Blur>>>Gaussian blur(1pxl)
3. Set this to Overlay

Now we will learn how to add a glossy effect.

1. Duplicate the sig.
2. Filter>>>Blur>>>Gaussion Blur(1pxl)
3. Set this to Lighten.

Another good way to touch up a signature is just to Sharpen it (Filter>>>Sharpen>>>Sharpen)

Now we will learn how to add a nice effect.

1. Add a Black & White gradient map.
2. Set it to 33% opacity.

Hope you enjoyed this tutorial!