I'm translating "Museum" into "relaxed".
I had to vote, so I went with "museum", but actually, I think that it depends mostly on the character.
I'll give a practical example: the original "Cover Girls of the DC Universe" collection, that was released by DC Direct before the company's rebranding into "DC Collectibles", was based on the art of Adam Hughes, and mostly featured heroines in iconic poses, on round black bases with the respective logo, and a strong "pin-up" feeling.
Most of the statues of the line followed those patterns, so most of them were posed in iconic, relaxed stances. Some, like Supergirl, Wonder Woman, and Kingdom Come Armored Wonder Woman (yes, there were two statues of her) weren't relaxed, but still looked fine because they were in victorious, heroic stances that fit their character very well.
My problem came with the LAST character released in the line: Raven. Anyone who's read the comics knows that Raven tends to be a shy, emotionally reclusive woman, that constantly restrains her emotions because getting too excited would provide her father, an extradimensional demon named Trigon, the element he needs to open a portal to our dimension, and invade. But the statue was posed so dynamically, that there's no way you could see a shy reclusive mystic woman struggling with her emotions. In no way the statue was portraying that. It annoyed me to no end, because the statue came out like it was about a Raven, but in that pose I just couldn't really see Raven. At best, it was a statue of a fangirl cosplaying as Raven.
To sum it up: The statues need to reflect the personality of the character. Some characters are better portrayed in dynamic stantes, and others, in relaxed poses.