Why is she always wearing colored contact lenses?

First of all, she doesn't lighten her skin. That's her natural color (light brown) and she was that color in the Miss World competition too.

And the difference between skin bleach and tanning? Tanning is something that occurs naturally and that anyone from any race can do. Skin bleach is something unnatural which is terrible for your skin and was introduced by racist British colonizers. I don't know how popular those products are and doubt they even work.

As for a white woman dying her hair brown and wearing green contact lenses, they grow up seeing other white women with different hair colors and eye colors and want to try out a different look, which is perfectly fine. How many Indian women do you think Priyanka grew up seeing with brown hair and hazel eyes? Most Indian people have the EXACT same hair and eye color (and by exact I mean the exact same shade with not even the slightest difference) as Priyanka Chopra. Exact same black hair and exact same shade of brown eyes.

That said, her nose job is very Indian. It's still an Indian nose.