That's a digital touchup of the Japanese movie poster art, which had more washed-out colors:
This is the best one. I remember having a poster of the one LordGigaIce posted, with the big Decepticon behind Prime (this was in like the late 80s/early 90s, with the original logo rather than the RID2001-onwards one). Never associated it with the movie myself because there's absolutely nothing movie-focused about it -- and even wondered if it might be a bootleg because of the incongruous Decepticon logo. It might be a perfect MTMTE (the original 3-parter) or cartoon promo poster because it has the general main elements from there (the ships, the volcano, even Ravage escaping Hound) -- except, bizarrely,
Megatron. To Starscream's delight. "Megatron has been omitted from this poster! I, Starscream, am the new leader!"
But
this poster, wow. Hot Rod's torso parts seem to go in two slightly different directions, and I wish the background had the Quintesson ship instead of or in addition to the Lithone escape craft, but it really encapsulates the movie. Core cast is there, maybe with some noticeable gaps (maybe have Wreck-Gar and Junkions in the distance on the surface, and Galvatron and co in the distance in space) but it's less busy for it. Unicron is a looming threat in two ways, Hot Rod (maybe makes more sense than Rodimus, it's fine) and the Matrix are the focal point, and it's dark and atmospheric (a different version with the wild and saturated 80s color palette might be nice, but not in place of this).