See anything wrong with my texture and material?

Hi, I have been having a landscape painting problem for over one month and so far no one found the cause. I am trying to find other leads to discover the cause. So here goes one question.

Do you see anything wrong with the picture below for the texture and material using it? It won’t show up in the material node and eventually, does not show up when I paint it on my landscape. So maybe the cause is somewhere in how I define my textures or material?