Her hazel eyes are really attractive.

Blue : of a colour intermediate between green and violet, as of the sky or sea on a sunny day.
Greenish-blue : greenish-blue color also called cyan.
Green : of the colour between blue and yellow in the spectrum; coloured like grass or emeralds.
Reddish-brown : another colour especially of human eye.
Hazel : a reddish-brown or greenish-brown colour, especially of a person's eyes.

Synonym of Hazel is Reddish-brown