One of the most effective (and entertaining) ways to learn and practice elongating your vowels is to model yourself after other women who do the same. Some of the best role models for this are iconic actresses from an era gone by. They stretched out their vowels a bit more than most women do today, so it’s a great help to listen and practice along with them. Exaggerate! Then, integrate that into your own natural style and listen to the modern day women around you and on TV, to help guide you.
And, don’t mind the slight variations in accents. Just work with the rhythm, pitch and tone!
There are tons of examples out there. Here are just a few:
Have fun! You may want to dress up while you do this, it’s a very glamorous exercise!
Keep up the good work and “see” you soon!