A practical first step is to retouch the eyebrows locally rather than trying to rebuild them hair-by-hair.

Use Lightroom or Photoshop to select just the affected eyebrow areas, then reduce the brightness of the pale patches. Lowering highlights is the simplest approach; alternatively, use Curves and pull down the bright end to suppress the whitish areas so they blend back into the natural brow tone.

If you have Photoshop, a more controlled method is to make the selection by color/hue so you target only the lightened cream-affected areas instead of darkening the whole eyebrow. That usually gives a cleaner, more natural result.

RAW files will give you more latitude, but the same local-brightness correction can still help on JPEGs. Since cloning full eyebrows from other images hasn’t matched well, tonal correction of the existing brows is likely the better path, with only minimal cloning if needed afterward.