--chaos : set how varied the results will be. A good start is 50. 2. --ar : set the aspect ratio. The default is 1:1. You can change to 6:9, 3:2 etc. 3. --s : how strongly midjourney's default aesthetic style is applied. The default is 750. 4. --seed : A number to track your generation history. The default is -1, which means to generate randomly. Put your own seed number if you wants to stick to your history.