Describing vowels is a bit more difficult than describing consonants. This is becuase within the bounds of the 'vowel-space'(generally around the palatal region) there are literally infinite numbers of possible vowels, and any one person's vowels are different from any other person. This of course means that a general description of a vowel is much more an approximation than an exact description. Of course, there are parameters for describing vowels, just as there are for consonants. For instance, (in my dialect), the English word 'pin' has a high front lax unrounded voiced vowel, and the vowel in 'go' is a close-mid back tense rounded voiced vowel. Thse are the parameters, for the most part:
Height:
'Frontness:'
Other stuff:
Modifications: