Hi Cathy,
I wouldn't describe this as flat. You've got a full range of tones. Composition is lovely (some might say too tight, but not me, I like it), and you have eye contact and a nice expression. The photo is bright & well lit and suits the subject. I'd lose the double border & drop shadow but that's a personal thing. Sharpness looks good.
Do you feel that this image is flat? Pushing the contrast to add more blacks or more at the black end would add a moodiness & grittiness that I'm not sure would work with the subject...