Style Reference (--sref) lets you provide a reference image and Midjourney matches its visual style — colors, textures, mood — in your new image.

How to Use --sref

a mountain landscape --sref [image URL] --sw 100

• --sw (style weight): 0–1000, controls how strongly the style is applied

Use Cases

• Brand consistency — match your existing visual identity
• Match a photographer's style
• Recreate a specific aesthetic from a reference image
• Generate marketing assets that match existing materials

Reference:

Style reference documentation

https://en.wikipedia.org/wiki/Special:Search?search=Style%20Reference