Good question, but the look of brick walls is appealing, and there are some subtleties in colours.
I’ve (eventually) figured out how to use watercolour pencils, so I immediately - of course - set out to misuse them:
Here I have just put the colours in fairly randomly, with some purple and orange among the reds and browns.
Then, I painted over the watercolour pencils with a mix of gouache and transparent watercolours : red-brown for the brick, and yellow-white-black for the mortar.
Came out fairly good, apart from the mortar being too yellow. Also putting black dots/drybrush on the bricks not quite right.
Here is the link to the finished item on Etsy