How to draw rain in Photoshop
First of all, you will need photoshop, obviously.
Open up your image, the one you’ll be using to put rain on top of.
Select the brush tool
Make sure the colour selected is WHITE
This part is very important. MAKE A NEW LAYER.
Start drawing diagonal lines onto the canvas. Doesn’t matter how neat or messy they are. Just draw lines like this all over the canvas, (make sure they are all pointing in the same direction though)
When you’ve done that, click Filter, Blur, and then Motion Blur.
Make sure the angle dial is pointing in the same direction as the white lines you drew. You can adjust the blur amount here too by using the slider.
I advise you change the opacity of the rain layer as well. Rain IRL is hard to see very clearly, so I’d say move the opacity way down than to what it is right now. Maybe somewhere around 20%.
And that’s how you can get a realistic rain effect in Photoshop. C: