Adjusting Special Effects
Go to Layer on your top menu bar, then select Layer Style, then Style Settings. On the window that comes up, you can change the size of your glow, the color of your glow, and the opacity of your glow.
For an 800-pixel photo, a good size for the glow is around 50-75 (See Photo 1.)
I like to change the color to pure white. Click the little square (my default is a light yellow) just to the right of the size. (See Photo 2.) Change the RGB value to 255, 255, and 255 and click OK. (See Photo 3.)
For an 800-pixel photo, I usually leave the opacity at the default, which is 75%.
Experiment with these adjustments to find the settings most pleasing to you.