It's very important to me. If you check my collection online, you will see that I always try to put the name of the artist when/if I can find it, especially for French, Italian and Eastern European posters.
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I think it's great to list the artist, too, regardless of country, if the artist is, or can be found out. As an example, there are so many on EMP's database, and each one asks that if anyone knows the artist, to let them know, so they can update. Ive done this a few times, even for artists that maybe only did a couple pieces, if i happened to come across the name on some other site. It just helps with the overall info about the piece and learning about the artist behind that poster.
@ Gingerman- thanks. In reading a bit about Felix, she was friends with Picasso, and when i learned that this film was a Spanish production, I thought that maybe Picasso could have been asked to quickly add his touch to that poster (or got permission to use something he had created prior, art-wise, on the poster).
So far, tho, nothing to verify that. The search continues.
And Belgians are amazing. Their spot on art of actors is unsurpassed, many times.