In a remarkable spot of serendipitous synchronicity, I was just alerted to the existence of TinEye, a reverse image search engine. If you've got an image and are trying to find its origin, or to find a higer res version, or an uncropped version, you can upload the image and TinEye will find other versions for you. Rather cleverly, it uses image recognition rather than just keywords or whatever. (Thank you, Dr Cook!)
Which means that I'm able to re-post the image from the previous post in higher res, which will make Mr Howard very happy indeed.