I dont get how to blend them together with a brush, you mean with a huge brush (of texture?) erase a part of each image so they blend each other into one? Then how to chose my images : One for the background with nearly no texture, a granular sand and one with huge imperfections?
But then how do I melt them (for the 2 first ones i can see but for the 3rd one with the imperfection, shall I use a "darken" melting option ?).
Thanks for being that fast.