There aren’t universal slider values that guarantee a “natural” result. What looks natural depends on the scene, the original exposure, and your own judgment.

A useful rule is this: most controls can either correct the capture or create an obvious effect. Small adjustments may compensate for camera/exposure limitations; stronger adjustments start to look stylized. Where that transition happens varies from image to image.

Some practical guidance:

• Use edits to restore what the camera failed to capture, not to force a look.
• Be especially cautious with strong contrast, local contrast/clarity, and highly saturated color modes.
• If your software offers picture styles or profiles, avoid obviously boosted options like vivid or landscape if your goal is a neutral result.
• A good way to learn each control is to push it too far, then back off until the effect stops calling attention to itself.

Also keep in mind that no photo is truly “natural” in the same way human vision is. Framing, perspective, depth of field, and tone rendering are all interpretations. So the best standard is not a fixed number, but whether the edit feels believable and doesn’t distract from the subject.