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Seems kinda inconsistent. I'm seeing thin lines, thicc lines, flat, 3d, colored and monochrome all together
The icons don't all speak the same language, true. Some are way more elaborate and detailed than others, which just makes them look off.
Maybe the library could be a single book instead of an entire bookshelf, for example?
There's another icon called "folder-book"
Ah, didn't see that one at first. Even that icon is still too different from the others though, using thinner lines and no fill. Hm
Jesus, it's so inconsistent. I suppose that may be beneficial when looking at all of your folders at a bird's eye view but my knee jerk reaction isn't the most positive.
filled areas and outlined, simple and chaotic... :-)