Add Glow to png

[Rob1955]

I'm trying to design my own smart watch faces, for my watch, which I've done before, by copying images, and editing them. I've found a png watch face I want to use, but on the background I'm using, it doesn't stand out very well, so I want to add a glowing effect to the image. Can this be done? I've seen tutorials, on creating text, and giving it a glow, but this image is already created.