You might have remembered that I also reviewed the first art book, 世界樹の迷宮 公式設定資料集 (Sekaiju no MeiQ). It seems that they skipped the art book for Etrian Odyssey II (the other name for Sekaiju no Meikyuu).
This is a 192-page paperback art book, 80 more pages that the earlier one. So it's filled with more chibi goodness which comes in the form of designs for the characters (including NPC), creatures and enemies. The colouring is anime-style and the illustrations are really cute.
There are lots of costume changes to check out. I really like the costume designs. They are refreshing and elaborately drawn.
The background art is also very beautiful, idyllic and has a good fantasy feel to it. Most of the pieces are accompanied by sketches as well.
It's a nice art book if you like video game art or chibi characters. There's more content at the same price as the previous art book.
Visit Amazon to check out more reviews.
If you buy the links, I get a little commission that helps me get more books to feature.
Here's the Amazon Japan buying guide for your reference.