What? A smooth transition and you call it a custom brush? Wouldn't a globby look be more assumed of being a custom brush?

Also, I get what you mean now. I did it pretty quick this thing, didn't think about that. Though it will be hard to make that not seam with the uv layout i have.

Also I never use custom brushes, unless it's for things like scratches and things like that. These are custom brushes I made though.

How I'm doing this is a nulled version of my snow detail map as a top layer, and I'm simply rubbing it out with the eraser to expose a nulled version of my cliff detail map underneath.