Prep your project 1. Update to the latest version of Photoshop to use these features. 2. Open make-new-background.psd, a PSD with 2 layers (New Background and Model). Or, use your own.
Select the subject 1. In the Layers panel, click the Model layer and choose the Quick Select tool. 2. Click Select Subject, then click Select and Mask.
Refine the selection 1. Move the Shift Edge slider to the left (-100%). Click OK. 2. In the Layers panel, click Add Layer Mask.
Note: When you leave Select and Mask mode, the background comes back. It should disappear when you apply the mask.
Unify color 1. In the Layers panel, Alt+drag the New Background layer above the model to duplicate it. 2. Click the duplicated New Background layer. Choose Filter - Blur - Average. Everything turns green. 3. Alt+click between the green layer and the model layer to create a clipping mask. Green fills the model. 4. Make sure the green layer is selected, set the Blend Mode to "Soft Light". Reduce Opacity to 45%.
Add color effect 1. In the Layers panel, choose New adjustment layer, then choose Solid Color. 2. Choose a dark blue from the picker (e.g., #080c56). Click OK. 3. In the Layers panel, set the Blend Mode to "Soft Light". Reduce Opacity to 50%.