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Now that we have the fire effect under one layer, let's apply a set of effects over it to make the fire look more like an abstract light. So go to Layers Palette and add Hue/Saturation and Brightness/Contrast adjustment layers, then select both and hit Ctrl+Alt+G for Clipping Mask.
Move further and apply now Color Balance adjustment layer (use Clipping Mask).
Finally, use the same way for the last adjustment layer – Levels. Remember that you can always adjust your adjustment layers, for instance – lower the opacities, or paint on their masks if you feel that the effects are too strong. When you're done adding adjustment layers, the image should look similar to the second one below.
Next, go to the Layers Palette again, hold Ctrl and left-click on the model layer's thumbnail. This should bring up her selection ad you see in the 1st image below. Then create new group right below the fire layer and while having the selection active click on the Add Layer Mask button.
Now when you add anything to this group, it will only affect the silhouette our woman. So first of all, create a new layer in this group and change its Blending Mode to Linear Burn, change the Opacity to max. 30% and paint with soft brush (use #8be7ff color). This will add a very slight blue colorization.
Now add another adjustment layer to this group – Color Balance. Use settings from below. Then grab Paint Bucket Tool(G), pick black color and fill its Layer Mask.
Now, grab Brush Tool (B), make it very soft, change the color to white and start revealing the layer mask. Use the arrow indicators from step 39 as a reference for painting. Basically, we're causing a blue fire reflection over her skin.
Next, again add another adjustment layer in this group – Curves. Adjust it as shown, separately for every channel (Red, Green and Blue – all 3 are in the same position). Then refer to step 40, fill the Layer Mask with black again and now using white brush (while painting on mask) add some shadows as indicated.
Continue adjusting the character. Everything goes about the light, we need to create an impression that the blue fire is really there, that's why she needs some more blue tones over front of her body. So now add in this group another adjustment layer – Gradient Map, set it as shown below.