Hi Valerie,
Your painting is accurately drawn and nice as is, but as Richard said it would really stand out with the application of cool tones. The overall warm orange of the face tends to blend together too much, and also blends in with the similarly warm background.
You could use a lighter, and much more muted version of the blue color of her sweater to hit some of the highlights on her face. The color you have on her eyelids might work. Also try changing the hue of red on her face to add interest. For example, in the photo, the red above her ear, by her hairline, is different than the red at the fold between the cheek and the mouth. Now that may simply be due to the printing, however, in general having red that is more magenta, or blue, or orange in places adds interest. Chris Saper is a master at that. I've learned a lot just studying the paintings in
her book.
Darken the neck a little, so the face will pop out more, use a grayer version of the orange that's there now, perhaps with the addition of some blues or magentas.
If you bring some of the blue of the sweater into the face, than the sweater won't stand out so much, but you should still probably gray it down a little. The hair is also nicely drawn, but would benefit from the addition of some cool tones.
Hope my comments aren't too general to be of use.
Regards,