Well, if you're concerned about details like that, I don't think the Suikoden world includes printing presses or cameras. Even if both exist, I wonder how likely the enemy is to have access to 8x10, glossy head-shots of the rebel leaders.
This is kind of a neat idea. From an artistic standpoint, I wish you'd done more than slap a JPEG on a template. Looking at them as the equivalent of our 19th century wanted posters, the border of the wanted persons photos are too fine, and they probably couldn't have produced those white backgrounds without layering paper or using two different printing processes.