Taking a photo of a body part

I have a fingernail fetish. Not at a pervert level, more casual.

I ride my commuter bus everyday only to notice a lady on my bus who has very unique nails. A rare find.

I can't help but to admire them.

Would it be weird if I complemented her on how well she grooms her nails and asked if I could take a photo?

There are numerous community sites that provide galleries of unique nails.

Is it normal?