The Face of Holden: Freddie Bartholomew in Captains Courageous (1937)
In chapter 13 of The Catcher in the Rye, when Holden is talking with a prostitute named Sunny, she says that Holden looks like the boy who fell off the boat in a movie she saw.
That movie, as identified by Peter Beidler in his book A Reader’s Companion to J.D. Salinger’s “The Catcher in the Rye”, is Captains Courageous (1937) starring Spencer Tracy.
The boy who fell off the boat was played by child-actor Freddie Bartholomew. Based on the reference from the book, Bartholomew was Salinger’s model for Holden Caulfield.
Here’s a picture of the actor closer to Holden’s age.
Is this the face you had in mind? Let me know in the comments.