Lithograph Crayon Grain Study Visual

Inputs: [authorized lithograph detail], [artist medium notes], [three marked study areas]. Describe the grain and mark density in a documented crayon lithograph. Compare the three supplied regions without inferring stone preparation, chemical recipes or exact tool pressure. Preserve the difference between visible observation and artist-provided process notes. Produce an equal-scale macro triptych preserving each reference region without smoothing its grain. Adapt the presentation to [audience] and [tone]. Check the defining task detail against the inputs before finishing.

Use the attached references only for the specified visual attributes. If a required reference is missing, request it before generation. Produce one finished image with a deliberate focal point, consistent geometry and clean margins. Keep any exact wording on a separate editable label layer or leave its area blank. Do not invent evidence or present an illustration as documentary proof.