Picasso

The intro from "American Life in Poetry" read, "The great Spanish artist Pablo Picasso said that, in his subjects, he kept the joy of discovery, the pleasure of the unexpected."

I like this poem, but I don't necessarily like how the em dashes and line breaks are done. Agree? If not, help me see why this it makes sense.

"Picasso" by Tim Nolan

How can we believe he did it—
every day—for all those years?

We remember how the musicians
gathered for him—and the prostitutes

arranged themselves the way he wanted—
and even the helmeted monkeys

with their little toy car cerebella—
posed—and the fish on the plate—

remained after he ate the fish—
Bones—What do we do with this

life?—except announce: Joy.
Joy. Joy—from the lead—

to the oil—to the stretch of bright
canvas—stretched—to the end of it all.