I love painting with watercolors traditionally, and always search for this look in digital world, in my 2D illustrations but also in 3D.
I am not super experienced with Blender so I doubt I could create such great watercolor shaders like these from the brilliant entry art for Blender 4.0 by Gaku Tada! But I can play with them, especially by joining them with my scanned watercolor textures! It is so great we can access this file and try to figure things out! Thank you!
Also another great inspiration were stunning watercolor flowers paintings by Yuko Nagayama
Not fully there yet with a watercolor feel, but it was a nice start!
Sped up process: