Step 1 – Setting Up Background:
Create a document of size 750 by 550px.
Set your foreground color to #505050 and background color to #000000.
Drag a Radial Gradient at the position shown in the diagram.
Step 2 – Cropping the Model:
Crop out the model with Pen tool. You can check out this post to find out how. Go to Image > Adjustments > Levels to tone it darker.
Open up the vector curves you downloaded from Vecteezy in Illustrator. Select the curves and press Ctrl+C. Switch back to Photoshop and press Ctrl-V. Select Paste As Smart Object.
Postion the curves as shown on the left.