Randalf
Ancient Mariner
I can understand that they wanted to do something different. However history showed that it was a failure thus never have seen such a cover again.
While the cover art (the initial and the alternative) of The X-Factor are definitely far from their best, I don't thin it's actually that terrible of a failure either. In fact, I'd say it lands somewhere between and interesting obscurity among Maiden album covers and being an ok cover art that somewhat fits the album and it's visual coherency very well.
I mean, as far as Maiden album covers go, I've never found TXF that bad and while it's... kinda ugly, I don't think it sticks out in a negative way. It's grotesque, but quite memorable and fits in to the visual world of the album. I mean, I appreciate it for not being super lame like No Prayer for the Dying cover, which is artistically ok and well-drawn, but not very interesting; in fact, I'd say it falls well behind most of their single covers, even. I wouldn't say it's bad, but it's probably the most meh album cover in their catalogue. The X-Factor, Dance of Death and even The Final Frontier, to some extent with it's alien-esque figure or whatever, manage to... shock or make you feel something, for better or worse. NPFTD is just... ok album cover, but absolutely nothing else.
Ah, apologies for getting carried away and blahblahblah, once again.
As for Senjutsu cover art, I think it's not quite as tasteful as TBOS, which sort of served as a nice parallel with debut album cover art.. oh boy what a journey Eddie has had! However, the samurai Eddie is still quite a striking figure and it does work well enough - it's just not quite as impressive as a sole album cover art, as impressive as the Eddie itself and the overall graphics and visual theme seems to be. In fact, that has been a trend for a ten years already: TFF & TBOS both have a quite strong visual theme going through the album and the booklet art, t-shirts and stage set design, but unlike in the 80's the album cover itself isn't quite as clearly the centerpiece where everything is drawn from, but just a one piece of the larger whole, if you catch my drift.
To put it short, I think Senjutsu cover art is good as it is and Eddie looks positively brutal (but thankfully not quite as funny or over the top as in TFF cover art, for example), but it's not quite as successful at pulling off the same trick TBOS did.