Drawbacks

• The background may appear darker than anticipated.

• Don't expect many sparkles.

• It may affect the overall image balance.

Negative prompt

dark background, black background, night sky, space background, deep shadow, underexposed, low exposure, vignette

However, these can also be advantages.

I’m making this public simply because it’s inconvenient to keep track of it privately,

but I personally expect to use it quite a lot for playful experimentation.