I went through this 30 years ago, when I was writing articles for OGR and OSN pretty much regularly. This was before digital cameras, so I was submitting Kodak prints.
most folks take pictures of people, cars, landscapes, sunsets, etc. When the print machine sees a black locomotive against a light background it darkens the background so you can see it better. In the process your black locomotive becomes a blob.
One of my copilots suggested that the info was on the negative, and explained all this to me - so I learned how to specify "density." Sometimes I had to stay there and insist.
Now, of course, you go into the editor, and make it lighter. You can also sharpen it up - they have a digital autocorrelation function with various names.
Daniel has given me permission, so I will treat the photo you are interested in on the big computer. The ones I have already done (above) are iPad-edited - not as good an editor.
