As you say, a question of relevance. The images of Bouch's bridge appear on Bouch's page; Bouch was an engineer who designed bridges. Yolland was a map maker and railway inspector: images on Yolland's page should, in a similar way, reflect his career. What relevant material can you offer to fulfil this? Why do you insist on two images, very prominently displayed, containing only loosely relevant material? The policy clearly calls for "bold" deletion of such material: I am at fault for merely reducing its prominence. You wish readers to "judge the scale of the disaster": I have now added the link to the correct Wikipedia article so that they may do so, in an appropriate level of detail and with these images (and one of mine—I've no objection to images that are relevant) included.