Note his blue eyes, light skin and straight nose. Persian is an Indo-European language and modern-day Persians are at least partially descended from Indo-European invaders who swept out of Europe, passed through the Middle East, conquered India, and, I think, some swung back into what we now call Iran. Up until WWII, Iran was called Persia. I think that the name "Iran" is derived from "Aryan."
Yeah it's not very hard to tell the difference between Iranians and surrounding countries in the mid-east. Iranians are generally much lighter skinned, and have different facial structure -nose, chin, jaw.
There are some parts of Iran like Kuzekstan which borders Iraq where the people are generally darker and look more Arabic, but in general the people have a different look than Arabs.
The very term Aryan is derived from the Sanskrit-IRani word "arya" meaning nobleman/gentleman