The lighting on the hair and the vibrance/saturation in the colors on her face look wonderful!
keep practicing.. I find the easiest ways to edit clothing like that is to either work with curves/change the tint of the clothing.. or if you must draw it on.. the lasso tool does work wonders.. I prefer to clone stamp as much as possible.. although I do have a drawing tablet... I am not all that good with drawing..
gaussian blur works wonders for lighting and makeup (as mentioned above)
Keep practicing! you will find tips and tricks that work for you...
i know evie has some really good tutorials you may want to check out!