'justice took no revenue in this trial of truth; a glimpse of hope finally appeared.'
I don't even know what that means, and I'm 31!
IMO, a 13 year old might make the clouds comment, especially if the character is a particularly introspective and observant one, but not that justice comment. It might be just me, but phrases that are just too complicated don't sound right coming from certain people. Imagine some illiterate Middle Ages peasant working in the field making comments like these and you'll see what I mean. I'm not calling teenagers illiterate peasants, but every group has its average of intelligence, and it just seems the average 13 year old wouldn't make such observations.
If it's a 13 year old of above average intelligence, then it makes perfect sense, but you have to keep in mind that the majority of people don't talk/think like that, even if they're adult. (In truth, my speaking/writing is more elaborate than my thinking; my thoughts, if put into exact words, would probably be really moronic!) Flowery prose works only when it's a character who thinks in flowery terms. In my own writing I have some characters who make the most bombastic statements that would sound stilted or ridiculous coming from any of the others, but I hope these comments work with these characters because--well, they're bombastic. Everything is a BIG DEAL to them, thus they use BIG WORDS. The other characters who think in more average terms use more average speech.
Ditto for flowery words/description in narration; it works if it's from the POV of a character who tends to observe things in such a way, but for other characters, and just narration in general, it sounds too forced and inauthentic. It really would make me, at least, stop reading and think, "What the heck is this writer trying to prove...?" Either that, or I would just have no idea what's going on.
That's just my opinion...I'm obviously a little dense at times. *ponders the justice quote again*