Create a duplicate layer of your image by right-clicking on the layer and selecting "Duplicate Layer".
With the duplicate layer selected, go to Filter > Filter Gallery > Artistic > Watercolor.
Adjust the settings to your liking, such as the brush detail, shadow intensity, and texture. You can preview the changes in real-time by checking the "Preview" box.
Click "OK" to apply the effect.
To enhance the effect, you can adjust the layer opacity or blend mode to create a more subtle or dramatic look.
You can also add a layer mask to the watercolor layer and use a soft brush to selectively paint over areas you want to keep more detailed or less affected by the effect.
Save your image as a new file to preserve the original.
That's it! With these simple steps, you can create a watercolor painting effect in Photoshop to add a unique and artistic touch to your photos.