Hello again,
The first thing you should do with ALL images you intend on working on is duplicate it to a new layer, then adjust the Levels and Curves, that will give you a well based image to work from.
I would then start by removing the tuft of hair using the clone and healing brush tools, whilst you have the tools open, you can remove the food from the face.
Other considerations:
Blemish Removal
Background Softening
Eye colour adjustment
Sharpening of the eyes and lashes
Neutalising the lips to an even tone
The eyebrow on the right as you look at it could do with a little reshapening
Skin tone correction
Dependnig on your skill level, perhaps paint in some new teeth.
That should be enough to give the image a nice makeover, make sure you post your results.