Good studio direction is specific without asking the model to change everything. Describe the key light, fill level, background material, lens character, crop, and pose in separate phrases.
Use Change background / studio when the product and model should remain fixed. Use Change pose or Change camera angle when composition must be regenerated. Do not confuse rotating a canvas layer with asking a model to turn around.
Compare variants beside their parent image. Weak lineage lines are enough to preserve context without turning the canvas into a technical node graph.