Janet,
I hope you don't think i'm following you around!
To me, the concern would be the values. Most of her face is the same value. This could be problematic. I know it would be for me.
But she is gorgeous and I love what she's wearing. She seems a natural. I'd get her under some directional light and definitely paint her.
She might be good to paint from life if you can. Her features are subtle but she exudes a presence.
Well, that's my two cents worth.