Add a Filmic Glow Effect in Photoshop
A popular look in film is to add a soft glow effect. This can be done in Photoshop to give your images a stylised finish very simply and very quickly.
Here is an image with the effect applied:

Before

After
To achieve this look here are the steps:
- Make a copy of your background layer. Using the keyboard shortcut of Cmd (Ctrl) + Alt + J lets you copy the layer, name it and specify the blend mode in one go. Choose Screen for the blend mode.
- This will make your image look dramatically different, but the effect is too harsh and we need to add some Gaussian Blur. (Filters > Blur > Gaussian Blur.) For this image, I chose a 5px blur but this will vary and depend on both the image and image size.
- Lower the layer opacity to around 50%.
- Select your background layer again and create a second copy using the Overlay blend mode.
- Add Gaussian Blur (I used 3.5px) and lower the layer opacity to 40%.
- Move your Overlay layer to the top of the layer stack. The position of your layers in the stack will give you a different look.

Layer Order
Play with opacity and blur amounts to suit your image. You can also push this further by adding a little grain or noise to a 50% gray layer, set to overlay, with reduced opacity.
Another variation on this effect can be achieved by using the Photoshop Diffuse Glow filter with these settings:

Filter> Distort > Diffuse Glow

Diffuse Glow Applied
This is a simply photoshop tutorial but really does a lot to the picture. Nicely done.