That's a great thing to do. I've found a few ancestors' photos on Find-a-Grave.
Found a photo of my great-grandfather on Ancestry.com. According to the text with it, he worked for the railroad in Holland. He was actually wearing his uniform in the photo. Looked like a conductor's outfit. My father came here from Holland when he was 8 in 1912. I don't know if he ever knew his grandfather...he never mentioned it, but he was named after him (Abraham), and looked just like him. And, my father worked on the New York Central Railroad his whole life.