I have come up with an intriguing way to warm a photo. Let us start with a very slightly retouched photo of Andrelica. Note that no skin smoothing has been applied:
Next I take the image into the Nik Color Efex Pro 4 plugin. I always start with a Darken/Lighten Center layer, then a Brilliance/Warmth Layer. Here is how the Brilliance/Warmth layer looks when the Warmth is set to 33:
What I do not like about the above image is everything in the image has been equally warmed. Sometimes this is nice, but in this case, I am am not fond of the effect. So, instead, I use the Brilliance/Warmth layer to actually cool the image. Next, I added a White Neutralizer layer which added a pinkish cast. I left it at the default setting of 30, but often I will take it down to 10 or not use it at all. Finally, I used a Pro Contrast layer set at 15. I exited Color Efex Pro and ended up with this:
Next MacPhun's Intensify CK plugin is invoked, and the Dreamy preset is selected:
The Dreamy preset always looks terrible at 100% opacity, so I reduce it in the plugin before exiting. Another problem is that it will often put blotches on the skin. So, after exiting Intensify CK, I will do the skin smoothing, followed by a little sharpening of the lips, eyes and eyebrows:
I love how this technique allows us to cool the image, yet warm the model, all without the use of layer masks.