I wish I'd picked up a - smaller - poster for an early Olivier Assayas film, Paris s'éveille (1991). It's not an amazing film, about a father, played by Jean-Pierre Léaud, and son who fall for the same woman, but it and Subway showed me the possibilities of cinema. Both movies star beautiful women - Judith Godrèche and Isabelle Adjani, respectively - and the poster images are great (see above).
The films are also notable for their soundtracks, another fascination (the score for Paris s'éveille is by John Cale). As is the way with French actresses, Godrèche recently recorded an album to support her directorial debut, Toutes les filles pleurent (2010). Benjamin Biolay features on the title track, while Piers Faccini guests on the album's stand-out number, Farewell.