Create a new layer and place it above all the previous layers. Paint it in black color with Paint Bucket Tool and apply the filter that is shown here: Filter - Noise - Add Noise.



Selecting the Motion Blur, it's possible to blur out this layer:



Change the layer's type on Screen and make the appropriate corrections on its brightness and on its contrast (ctrl+L).



Blur it out also with Filter - Blur - Gaussian Blur.



Select the Layer Mask and Gradient Tool to hide the lowest part of the layer.

 

We have to represent now a rainbow on a new layer, using the Brush Tool.



Blur it out also: Filter - Blur - Radial Blur.



Turn it vertically: Edit - Transform - Flip Vertical and change the layer's type on Linear Dodge. We have to distort it also, using the combination Edit - Transform - Distort. The layer's Opacity should be situated on 50%.



Pass on the rain's layer and correct the layer's colors (Selective Color).



Merge down all the layers: Layer - Merge Visible (shift+ctrl+e) and now we have to apply the filter indicated here: Filter - Render - Lens Flare.

 

Make a copy of this layer and blur the copy out, making use of the next selection: Filter - Blur - Smart Blur.



Change the layer's type on Darken this time and merge down the layers (ctrl+e).



Insert on a new layer a picture having portrayed on it a water reservoir:



Choose all the options shown here (Free Transform, Layer Mask and Gradient Tool) and place the layer above the picture to have the impression that the rain is falling out of the reservoir:



Apply to this layer the command Image - Adjustments - Gradient Map to select the same colors we have on the next picture:

 

Insert on a new layer the texture of an old wall:



Select the Clone Stamp Tool to hide all those exfoliated zones on the wall, just not to make dirty our picture.



Change the Blending Mode on Multiply and make the corrections on the brightness firstly (ctrl+m).



Then make the corrections on the color (ctrl+u).



We have to merge down all the layers (shift+ctrl+e) and make the picture a little brighter than it is now (ctrl+m).

 

If that is necessary we may apply the command Filter - Sharpen - Sharpen.



Finished!

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