It depends on what you expect from the title, which could be seen as a bit misleading. I was jumping up and down in the first 30 min, with the history of movie posters, great examples, the artists who were big. How illustrations were great, but lost space. I thought they would go then into the bad models that generate 300 similar posters nowadays...but then it drifted away.
The so-called "second movie" is about illustrations and artistry. Models created as an alternative to the official posters, and how there is a market and a community around these models. It's certainly a good topic, full of art and value, but not connected to what I expected. Probably better posters than the original, art, but...another thing. It becomes "a movie about posters that could be *the* movie posters (but aren't)".
I just don't think it ended the discussion of how the industry has dealt with posters. That was just a great introduction to bring the alternate world as the main course. If you are into it, you should really this doc.