It depends on the individual and all of their other features. Being a brunette with dark eyes is not a deciding factor in whether or not a woman is attractive. There's a lot more to it than that. Some brunettes with dark eyes are attractive and some are not. Those two features are way too generic to say whether or it is "attractive" to possess those traits or not.
I've never considered someone to be beautiful based off the color of her features. I would need to know more than that. If you want a general answer then yes I have found girls attractive with features of those colors.