I think SIT has a lot of support. That is a fun album cover with so many little details to look for, and I can quite imagine it winning. The album itself is very popular, too, and even if this survivor is about artwork, I can imagine those who most love the music also being fond of the artwork. Powerslave is another one with a strong theme and lots of detail.
Personally, I prefer the ones with a simpler image that sticks - in particular NOTB, and to a slightly lesser extent, Killers. NOTB works best with the primary colours (both the bright and dull versions of the cover). The more I think about it, the more I like Fear of the Dark, too. Such a simple and bold design with marked contrasts, and very memorable.