* Authenticity: The most important factor is proving the photo's authenticity. Was it actually taken in Korea? Who took it? Is there any documentation to support its origins?
* Rarity: If the photo is indeed authentic, how many copies exist? Was it a widely circulated press photo, or a unique snapshot?
* Condition: The photo's physical condition matters. Is it pristine, or damaged?
* Subject: The image itself is important. Is it a striking portrait, an interesting candid shot, or something mundane?
* Historical Significance: Did the photo capture a specific event or moment that would make it particularly valuable?
To get a sense of value, you'd need to:
1. Get the photo authenticated: Experts can assess the photo's origin and confirm its authenticity.
2. Research similar photos: Look at other known Marilyn Monroe photos, especially those taken during her 1954 visit to Korea.
3. Consult with an auction house or appraiser: They can provide a more accurate estimate based on the photo's specifics and the current market.
Remember: Even without specific details, a truly unique, authentic photo of Marilyn Monroe taken in Korea would likely be extremely valuable.