Rosarie Dawson does not show any similarity to a Persian Princess. Why a partly African actor plays a Persian girl? Are Africans some way related to Persians. As we will see Hollywood thinks so and consistently portrays Persians as Afro-Arabians using Azeri Turk actors.
Other errors in the film are Persians are depicted as Arabs using Morrocan actors. Also North East Persians are sometimes depicted as mongols or Turks. There were no mongols or Turks in Central Asia at this time and this area was inhabitted by Persians who were European looking people similar to Greeks or similar to how Afghanis look like today in North Eastern Afghanistan. Mongols and Turks invaded central Asia at least 1000 years later. Also Alexander going into Persia is depicted as if Greece was a high level civilization going into some nomad land. The reality is Greece was a small colony in Persia for 100's of years before Alexander invasion and Persia and Greece were equal in the level of technology and civilization.
The term "Barbarian" is used in the film to describe Persians. For Greeks "Barbarian" meant somebody who did not speak Greek language. It did not mean savage. But in "Alexander" the term "Barbarians" is used to denote savages. This sounds very strange as Oliver Stone had used very professional historians in the creation of the film. So Alexander was not going to Morrocco as the impression given by the film but Alexander was going to San Francicso if using a contemporary anology. Later Alexander declared himself the King of Persia and not the King of Greece. That indicates that Alexander considered Greece as a colony of Persia and not Persia as a colony of Greece. This was even after Persia was conquered and this indicates the level of Persian civilization. Alexander's capital was Babylon in Persia. Alexander adopted the Persian nobility dress and traditions and customs and ordered his generals to to so. He also appointed Persians to high office levels which caused revolt among his generals.
Alexander covers the period of Persian history a 1000 years before islamic period in the Persian history and woman did not wear any veils at this time as it is depicted in the film. Also Persian are depicted as some unknown nomads to Greeks. The reality was Persians were very familiar to Greeks and Greeks always asked Persians to intervene in Greek domestic politics and re-establish democracy in Greece when a tyrant took over a city state in Greece. Greek democracy was not possible without the help of Persians. Actually all these errors are not really errors as Oliver Stone had access to professional historians in making the film and one can assume were on purpose.
Generally speaking the film "Alexander" projects the present day realities or perceptions of today's realities into the past. It is not a genuine description of the past. The good point about the film is that it shows Alexander was not a Greek nationalist but was an empire builder and also the democratic structure of the greek army which made it possible.
Also look at Jonathan Ahdout with Ben Kinsley below. Mr. Ahdout is an Iranian Jewish actor playing a "Persian" character in the TV Series Fox 24. It tries to reinforce that Persians have big noses. Big noses is a typical feature of Azeri Turks. Mr. Ahdout is not Persian. Also Mr. Ahdout plays a "Persian" terrorist from the Middle East in one of his movies and kills his father in another movie. As most people mix up "Iranian" with "Persian", Portraying Persians and Afghans as arab looking terrorist is another problem faced by Persians and Afghans.
Also Hollywood has started to associate Mr. Borat who is a Albanian Jewish comedian living in England with Illyrian Turk origin with Persians. Mr. Borat is not in any way related to Persians. Mr. Borat face places him as related to Turks and not Persians. Mr. Borat claims that he is Wells-Persian actor. Mr. Borat does not look like a Wells from UK or a Persian.
Also note that Hollywood uses racism against Persians and other undesirable elements, but if anybody points out their methods and raises an objection then Liberal supporters of Hollywood will label you a racist.
Persians are composed of three major tribes in ancient times: The three main Persian tribes were Sogdians in Central Asia, Bactrians in Afghanistan and Parthians in Khorasan and North eastern Parts of Iran and Persians in South west Persia or Iran.