Thanks so much!
I didn't watch a tutorial, just made it up as I went along; I first drew everything in lineless colour, with flat shading (pen tool!). Then I used the watercolour brush. A lot. Really it was just softening everything out, adding more shading + highlights, and using pen tool at the end for contrast.
I've done a process thing actually: Bungalow Process
(You have a nice day too! Or night? Idk.)