Language is deeply tied to culture so when trying to create distinct cultures or subcultures within a fantasy novel it can be a very useful tool. From what I remember of my Spanish translation class in college in many countries where they speak Latin based languages English is seen as a terse and scientific language, good for writing about technical things. Whereas Spanish, French and Italian are often seen as more artistic, less literal languages, or languages of love. Also when translating between English and Spanish you can generally expect the Spanish to be around 25% wordier than the English (translators always wanna get paid per word in Spanish). This says something about the culture, I remember there being an odd tradition of seeing who could come up with the most drawn out and obsequious letter closing (Instead of "Sincerely" think "Your most loyal companion with nothing but love and devotion and admiration for your great intellect." or something like that). Also run-on sentences are strongly frowned upon on English, in Spanish just go for it, you have a whole paragraph without a single period, question mark, or exclamation mark? Looks good to me. Also in Spanish all nouns are gendered either male or female which also says something about the culture by which things they see as male or female. Also when looking at language subcultures in Mexico it is interesting to note that a large quantity of their swear words refer to "madre" or mother in English.