Have a look at a setup by Kai Müri and a tutorial by Diego Gangl to learn how to set up watercolor renders in Blender Eevee.
Kai Müri has recently shared his awesome experiments with watercolor shaders in Blender Eevee. Check out this model of Mr. Freeze made with Blenders Node Editor and Substance Painter. The work is based on an illustration by Ben Harvey.
"It is incredibly fun to work with watercolor textures and shaders. It gives you the artistic freedom to work loosely," wrote the artist. You can also find a Sketchfab version below. Learn more here.
Want to set up a similar render? Check out this tutorial by Diego Gangl that shows nodes you need to achieve similar artistic results: