Photoshop - How to properly apply a Gradient Map to a Brush in a layer?

Question

I have a this Watercolor brush and painted over a transparent layer

Then I add a Gradient Map to have the desired colors in the Watercolor

But when I try to clipping mask the Gradient Map to the watercolor layer it doesn't get the previous colors, they change

Even if I set a black gackground it doesn't get my desired colors

What I need is get my desired colors without the gradient back there, since it only works when the Gradient Map is applied in general (over all layers)

This is driven me crazy, I've tried a lot of differents combinations of blend modes and no results.

Is there a propper way to achieve this?

Answer 1

Did you try adding a Gradient Overlay Effect to the brush layer?:

Maybe the watercolor brush you are using comes with a certain type of transparency, because it does not happen to me

Answer 2

you first need to clear the background pixels (destructive editing not layer mask) from your watercolour sample before you make the brush. The gradient map is the going to use the tonal range of the remaining detail to map the gradient over.