I am mostly referring to the fact that portion of land the empire covers, has several different ethnic groups living in it, today one can see the diversity of appearances in india, Pakistan and several other countries that fall under the empires territory. https://www.quora.com/What-does-an-average-Indian-look-like
The first post in that links gives an example of some of the present ethnic groups in india, most if not all of these ethnic groups have been in India even before the mauryan empire.
Brown hair and varied complexions (olive, brown and black) is very common in the sub continent, other hair colors and eyes colors besides brown and occasionaly green is very uncommon but not completely unheard of.
I am predominently indian descended myself, light hair (brown and red hair) and colored eyes (green and grey) and varied complexions (pale white, olive, brown and black) are prevalent even in my immediate and extended family to varied degrees. AsIan looking people are also present in the sub continent especially north east india.
My grandmother (dad's side) is indian and she has blond hair and my mum has blondish reddish hair (though my mum is part persian and the red hair, sometimes light eyes and pale complexion is common in her mother's side, which is where the persian comes from), my dad has lightish brown hair and blue eyes and he is indian too (I don't know if my dad's maternal line is fully indian though, which is where he gets the eye color, hair color and complexion from) , although I think blond hair or blue eyes is very uncommon in India itself, also pale or white complexioned skin is pretty uncommon but is definitely present in some areas, probably too low in number to add as a common variation imo.