Best settings to make movie posters?

I have made a bunch of Apple Shortcuts to grab a movie title I have rated, and then creates a prompt for a movie poster which is handed off to DrawThings to generate the movie. It has been fun to see what it comes up with each time (I then have a script that gives me hints as to what movie it is). But I am not super familiar with DrawThings, and so knowing what knobs to turn has been confusing.

I am currently using the model "FLUX.1 [schnell]" so that I can use the LoRA "ModernMoviePoster". Is that reasonable? Are there better combos for making movie posters? The full json I am handing off to DrawThings via the http API is:

{
"prompt":"MVPSTR/nFinalPromt",
  "model": "FLUX.1 [schnell]",
  "width": 1264,
  "height": 1680,
  "loras": [
    {
      "mode":"all",
     "file":"modernmovieposter_lora_f16.ckpt",
      "weight":0.67
    }
  ],
  "steps": 13,
  "strength": 1.0,
  "cfg_scale": 7.0,
  "sampler": "Euler A Trailing",
}

With "FinalPrompt" being a generated prompt describing the poster. Any suggestions for changes is welcome.