Duplicate the model layer by pressing CTRL + J. Place it under the original layer.
Now use a soft round white brush to reveal the lower parts. Remember the aim here is to reveal the original shadow parts and don’t reveal the entire parts, only the shadow parts. Don’t worry about the other parts we’ll blend them later using a simple trick.
I have hidden the visibility of original models layer’s so you can clearly see how much parts I revealed.
Here is a trick that will help us to keep the shooter’s shadow without painting. Change the duplicated model layer’s blending mode to Overlay. You can see we got the shadows back without painting them.
Add a Hue/Saturation adjustment layer to duplicated model layer and reduce the saturation. Don’t forget to set it as clipping mask (press the red icon).
Layer Panel arranged so far:
Now back to original shooter layer and reduce the saturation using a Hue/Saturation adjustment layer.
Use a Level adjustment layer for shooter and, enhance the light and shade on the shooter.
Create a new layer, fill this layer with 50% gray colour and change the blend mode to Overlay. Don’t forget to check ‘use previous layer to create clipping mask’.
Activate the Dodge Tool (O) with Midtones Range, Exposure about 9-12% to refine the light and shade on the shooter. Use the Dodge Tool (O) to bring more light on left shoulder and little bit on right shoulder. Also, I used the Dodge Tool on the hands, legs and upper parts of the gun. Similarly use the Burn Tool (O) to add shade to left leg and many other areas where you want to keep the parts darker.
You can see how I did it in Normal mode.
Results in Overlay mode:
Create the Rain
Let’s create the rain now. Create a new layer and fill this layer with black color, name this layer ‘Rain’. Convert this layer into Smart Objects. Go to Filter > Noise > Add Noise and give the following values to Noise filter.
After adding Noise, go to Filter > Blur > Motion Blur and set the following values to create rain.
Change the rain layer’s blend mode to Screen.
Use a Curves adjustment layer for rain layer and increase the contrast using the following settings:
You can see the values I darken the rain layer a lot after that I got the rain as shown below.