I think its good , but i don't have much experiences in motivation letters , but there are a few things i recognized . First : You left out the word the in some parts like : "the richness of the spanish culture" ; it not a mistake Second: You often used the word opportunity , but thats not a real problem Well , wait for a native speaker, my first expression was that this motivation letter is good ! There are some parts you could improve but i'm not able to help you sorry...
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