It is not uncommon for mummies to retain some of their facial features even after thousands of years.
This is because the ancient Egyptians were skilled at preserving bodies using a complex process that involved removing internal organs, packing the body with natron (a type of salt), and then wrapping it in linen bandages.
This process helped to slow down the decay of the body, which in turn helped to preserve some of its features.
In the case of King Seti I, who reigned during the 19th dynasty of ancient Egypt, his mummy was discovered in the tomb of his father, Ramses I, in the Valley of the Kings in 1881. Despite the passage of more than four millennia, the mummy was found to be in remarkably good condition, with much of its facial features still intact.
Thanks to advances in modern technology, such as CT scans and 3D imaging, researchers have been able to study the mummy of Seti I in detail, allowing them to learn more about the life and death of this ancient king.