Killers is my favourite. Followed by The Number Of The Beast, The Trooper single, Live After Death, and Somewhere In Time because its so detailed and interesting!
Number of the Beast single, Trooper single, Killers, Somewhere in Time are the best IMO and I also like the remade Iron Maiden album cover...
Virus cover is simple but perfect.
I also liked Out of the Silent Planet very much and Raising Hell too.
Oh and the Maggie Thatcher cover is a classic too
What I dont really like are No Prayer and the new Run to the Hills cover (with Bruce on it).
I think they all look pretty damn cool, but I'll go with Somewhere In Time.The first time I seen it I just couldn't look away because it was so detailed and fun to look for all the references.
Powerslave is cool a lot of details like the waterfalls and such and the Somewhere in Time one kicks also, actually they have a lot of classic album covers.
Somewhere in Time, I had one of those 'lifesize' 6 ft tall long posters @ the top of my stairs of SIT Eddie, with a red spotlite shining on it back in the day....