I struggle with expressionism. I imagine this is because it is hard for me to translate the expression of one person's feelings in an art work into my own feelings, as my main currency of expression is words, a much clearer medium for ideas in my training. So, hello Twombly, who uses plenty of those, even if at times they are vague, illegible and hard to figure; at least they are signposts of sorts.
Twombly is variously described as daring, confident and so on, and this is plain in his brush and pen strokes, which have fluidity and great control. You might find yourself saying 'a four year old could do that', and in some cases they can and do, such as the early crayon drawings. But look again, there is so much more to these scribbles, Twombly has met Picasso's challenge, to re-learn to draw like a child, full on and so successfully; take Achilles' shield or Ra's boat for example.
And now for the nit - I have a particular bug bear about the use of the word poetry in relation to art. With Twombly, who made many works in response to poetry, that is perhaps a forgivable slip, but a painting is not a poem, not even if it's genesis is occasioned by reading Homer, Keats, Spencer and so on.