I would like to start answering this question with a rather cliche but relevant quote, “beauty lies in the eyes of the beholder.”
It majorly depends on your own perspective what you find beautiful and what not. For example, in my opinion, Pakistani and Afghani women are very beautiful, but my friend finds Spanish women the most attractive.
Afghani Model
Spanish Model, Helen Lindes
To answer your question on the basis of certain researches, the women of Turkey, Brazil, France, and Russia are the most beautiful. Then come the ladies of India, Italy, Venezuela, and Ukraine.
Sweden, Columbia, and Argentina are also in the list.
Shakira, Columbian Singer
The women in all these countries are known for distinct facial features, boldness, and pleasantness of appearance. Many successful models and supermodels belong to one or the other of these countries. Not just their faces, but the whole bodice is worth appreciating.