Photoshop creates blue elves

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final effect
1. Open the original image, copy the layer, reduce noise on the layer and then copy another layer.

2. Close the lower two layers and change the picture mode to lab mode.

3. Select the channel and make a copy of the brightness channel.

4. Return to the layer, change the mode back to RGB mode, create a new layer on top, and copy the brightness channel.

05 Create a new layer on top and fill it with blue. See the parameters above.

06 Create a new layer on top and fill it with blue. See the parameters above.

07 Duplicate layer 1 as layer 3, duplicate layer 2 as layer 2, add a mask to layer 2, and erase the face. Change the copy of layer 2 to soft light, and adjust the color of layer 3 to make the color of the person's face suitable. Merge, then adjust the light and shade appropriately and it's OK.

final effect