I think I understand. You are mainly interested in line breaks and initial caps or other punctuation that one might be able to do on an old manual typewriter in which a sheet of paper was inserted. You are not interested in the visual display that one might get with different fonts for example.
When I bring in illustrations in general, I'm trying to emphasize that all of those punctuation marks are "illustrations". I agree with you that there are better ways to punctuate a poem on a page than others, however, I disagree in thinking that a poem punctuated in one way is a different poem from one punctuated in another way. Maybe you don't think so either?
Thanks for the reference. I'll try to go over it today and give you some reactions.
Imagism isn't really new anymore. I think it is about 100 years old now. I wonder if poets are still thinking in terms of it whether they write free verse or metrical poetry. Most of the poetry I read on this site seem to me to contain ideas more than images.