The Van Gogh Museum, Amsterdam, just published the result of a several-years long thought about photographic portraits of the Van Gogh brothers.
Above: The portrait on the left is now accepted by all authorities as a portrait of young Theo van Gogh.
A direct witness of the van Gogh brothers different physionomies is certainly Johanna Bunger who described her brother in law after his return from Arles:
“Vincent returned from the South on May 17, 1890. First he was going to spend a few days with us in Paris… I had expected a sick man, but here was a sturdy, broad-shouldered man, with a healthy colour, a smile on his face, and a very resolute appearance; of all the self-portraits, the one before the easel is most like him at that period. Apparently there had again come the sudden puzzling change in his condition that the Reverend Mr. Salles had already observed to his great surprise at Arles. — He seems perfectly well; he looks much stronger than Theo — was my first thought…”. (Johannah Van Gogh-Bonger, december 1913).