Split/transform surface with image texture in Grasshopper

Hello everyone,
I am trying to figure out how to split a surface, with an image as its texture in Grasshopper.
Alternatively I can do split in Rhino, but would want to do transforms in Grasshopper.
I did end up at this weird result:
The horse image is split into 2 chunks, and the right side is assigned to the surface component in Grasshopper. Having moved this chunk, the elevated surface shows more details of the image, compared to the initial surface.
Is there anything I am missing?

test02.gh (4.7 KB)
test02.3dm (83.5 KB)


3. Attach minimal versions of all the relevant files

My appologies ,
Just attached to the initial post,