About the lights nothing again all depends of the original image!
Generally its impossible to recognize the original image when a small Init strength is used! :)

About the prompts of "engines" : it just "complex engine"! if i want some landscapes that will be something like
"complex engine on the beach" or "complex engine at mountain" etc...

About copyright if there are watermarks... i suppose there is no problem...(if there is no sale)

About the lights of engine...it's depend of the "render AI used"
some have natively different styles like Leonardo, ClipDrop...
other like Bing have not so you must put something inside the prompt!

The other solution is "Image to image" of an image imported... so light will be the same family of the imported image...
you can add of course other thing inside the prompt...

For the engines images you can input an engine from another IA inside an another and make variations! :)

Like here it's an only one Bing "engine" model inside Leonardo for variations ! It's an infinite game! :)
but impossible to know it's a Bing Model if i don't say it! :)
Big Zoom: https://imgbox.com/g/XA6KKVLEzI



Funny to see an evil tail on this model! :)