Knowing Halloween activities are usually Night Time events, you don't want your pic to be looking like bright and sunny as it may not fit the mood.
Try this quick tip to convert a day scene to a night scene with minimum change to your overall composition.
I use this when I find the scene is more fitting at night instead of daytime.
i) look thru prompt area for any "light", "sunny" word and remove them.
ii) if you run into something like "light smile", change the word to "subtle smile" to avoid anything bright
iii) in negative prompt, add "daylight" and "sunlight" so it will avoid these
Check the link below for example and prompt detail
Day and Night - 3 Pics | Tensor.Art
https://tensor.art/posts/786286925943344282
