The key to sounding as authentic as possible is to keep the vowels short. Spanish vowels are very choppy; they are never drawn out as in English. This is one reason that Spanish sounds faster than English. In English, vowels are sometimes "silent;" in Spanish, vowels are always pronounced.
There is only one way to pronounce each vowel in Spanish. Each is always pronounced as follows:
|Letter||Sound||Type||Word to Try|
Note that two strong vowels next to each other create two separate syllables: mu-se-o
Otherwise, two vowels combine to form one syllable: ciu-dad, vie-jo
Source: This content has been adapted from "Pharmacy Spanish" by Stephanie Langston.