High strength or mixing with other loras can introduce artifacts, safe range should be up to +2.5. Going into - strength is for illustrations, but needs a bit care because i got something wrong. It's more of an unidirectional slider, that suppresses the negative. The illustrations at the end are just to test something else it does, all with + strength. Of course you can use any kind of strength ( 1.25, 0.5 etc )
First slider, tricky to train those fuckers. Main reason for a slider is to keep the prompt as neutral as possible, while the slider does the work. Should give a bit more wiggle room so it's not necessary to narrow the prompt down to "Movie still", "Photograph", "Illustration" or anything else. You might even get away with the most basic prompts.