I quite like the TFA poster to be honest (and I think there’s a less ‘crammed’ version on the DVD), and you’re absolutely right about the TLJ one.
With the prequels, I loved the AOTC poster that had Anakin and Padme back to back (with words to the effect of ‘a Jedi shall not know anger or love’). I thought that was really effective.
I’m a total sucker for the original OT posters. That first Star Wars poster with Conan-Luke and the 8000 X-Wings just takes me right back to how the film felt for me as a wide-eyed 8 year-old in '77. I know it looks like hokey Frazetta art now, but it’s just a precious moment in time that should absolutely be adorning unaltered blurays of the OT. Similarly the ‘Gone with the Wind’ 1980 TESB poster evokes a similar feeling in me.
Finally I love the teaser ‘Revenge of the Jedi’ poster that hinted at a great movie that was sadly never made…