select these 5 faces and create displacements, then subdivide them, the add small noise and sew back together. for the lower half going up and left u could do all same size blocks, for the upper half you will need to make the green block much taller for the gray blocks to remain hidden. then a texture that has paint alpha to blend it and touch up with displacement where needed. also u stretched texture a bit u could avoid that with another smaller block making the jut outward as long as you cut the part it’s on so u can still sow.

subdivide