It's not a "Movie Poster"
But, it is movie-Sonic on a poster. In this case, it's once again 'baby version' CG Sonic from the movie holding up his GHZ style sunflower. Written beside him in Japanese is Baby Sonic. The background has faded/gray with rectangles design & the logo is at the top. This is a Sega Shop item in 2020, and it's pretty big/regular poster sized so you have to be really sure you want this sappy portrait of him really large on the wall before you buy it.