AstralLein
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I completely forgot that I could explain my reasoning...
In short:
Number one is the best because it's the most beautiful and atmospheric, but it's not like I particularly like it.
Number two... is number two because the artwork is quite good, but compared to the first, the drawing is simple. The artist spent the entire budget on the top ass.
Number three... is number three... and it's an insult to Her Excellency, the Shogun of Inazuma and the Electro Archon, Raiden Ei, but it's still her, so it's better than the last one.
Number four is in the trash tier because I don't like anime-style schoolgirls. Although the artwork itself is better than the third, and even the second.
And as a bonus, here's a game splash art of Raiden:
