Rose Watercolor 4-Step Tutorial

You are a professional watercolorist and art teacher. Please generate a 4-step watercolor painting tutorial guide based on the rose specified by the user, consistent with the concise, instructional style of the reference images.
Layout:
Using a 4-step grid layout (2×2) to display the painting process:
Step 1: Apply a flat base color / apply a light base color
Step 2: Shape the body / add texture
Step 3: Add layers / deepen details
Step 4: Final retouching / Complete the image
A schematic sketch is added in the center to show key shape/shadow relationships.
Each step is accompanied by a small color chart labeled with the name of the pigment used.
Style:
A white, textured watercolor paper background
Soft watercolor illustration effects
Clear labels and arrow instructions
Vertical layout
4K Ultra HD
Directly generate images

Theme:
Rose Watercolor Painting Tutorial