I guess since we have all seen the first movie the weird inhabitants of the museum have no reason to hide anymore, either from us or from Ben. Which is kind of unfortunate because a lot of the magic of the first poster had to do with getting a glimpse of this world of wonders lurking just under the surface of a normal museum. With all of them there front and center the effect is much diminished. Not to mention that the poster ends up looking a lot like one of those posters for the annual every-movie-under-the-sun spoofs.
Also making this poster worst than the ones for the original: that damn smirk on Ben’s face.