luchia,
welcome to
RP.
difficult image. i call these compound or complex fixes. there is a lot wrong here. the lighting was too low, there is pixelization, it's out of focus a bit and the color balance is off (probably due to the lighting). so, this is one you could spend 100 hours on and still not be done or satisfied with.
so, all i did here was work on the face a bit and some of the color balance issue.
first i added a contrast/brightness adjustment layer.
then a hue/saturation adjustment layer, mostly for the reds and yellows. i took the yellows back over into the reds a bit to get some better skin color and lowered the saturation on both the reds and yellows.
after that i made a new blank layer and started cloning out the odd spots and some of the pixelization. i also used a lot of airbrush and the brighten/darken brush. actually, i did this all with several blank layers and on almost each layer i would do the work and then do a gausian blur to the layer for better blending.
when i had things a bit better i did a copy merge to new layer, turned off all my other layers except that and the original background layer and set the copy merged layer to 'screen' blend mode.
on top of that i added another contrast/brightness adjustment layer to take the light down a bit (screen blends tend to brighten things up) and added a tiny bit of contrast.
did another copy merge and done.
this is far from being done. i mostly just wanted to do the head, neck and hair a bit to demonstrate.
if you have another picture of your daughter, especially one with a similar pose on the head, you might try cloning part or all of her head onto the angel picture. in the long run that might be easier.
craig