She is sooooo Cute...
They are a little underexposed... unless you were going for dark and moody..? Were you using studio lighting?
Since you asked for help/suggestions...
Here is a little PP adjustment that may help...
A little curves bump, and then some levels adjusting... (masking out the lighter side of her face by about half) .......plus color balance to remove a magenta cast... ( thinK I put too much red now, but you get the idea)
If you are shooting studio strobe, it would be good to meter beforehand. If you don't have a meter, then I'd double check the histogram to make sure the highlights are peaking properly.
When all else fails.... adjust the exposure in RAW and then go to PS from there. 
Did I say she is so cute... I love the personality you've captured here... so fun!!
HOSTED PHOTO
please log in to view hosted photos in full size.