1. Open your image in Photoshop. Do the usual adjustments, Levels, Contrast, etc.
2. Create a saturation adjustment layer and desaturate the colours (a rough guide is -38 but it really does depend on the image).
3. Next create a channel mixer adjustments layer and set the colour values to: red:+36; green:+28; blue:+36. Then tick the monochrome box.
4. Switch this layer’s blending mode to soft light.
5. Highlight all the adjustment layers, then hit Ctrl A to select all, click Edit > Copy merged and then click on the original image layer, now hit Ctrl V, this pastes the copied layers above the original image but below the adjustment layers. Apply the diffuse glow filter (filter > distort > diffuse glow), filter as much as you think looks OK then add gaussian blur to the image, around 5px works well but play around until your happy,it depends on the size of the image.
6. Switch this layer’s layer blending to soft light, that’s about it.

You can now use tools such as localised blur, burn and erase to tweak different layers and parts of the image.

This is a re-written tutorial based on this site I have added a few extra instructions to help you along the way.

The original idea came from trying to re-create effects used by photographer WES DRIVER