Ok, took the liberty to take your image and try some stuff on it. I didn't add any color, so, because you already used the burn tool a bit too much, some parts look burned or you can say she's got very redish hair with a red light on it. :-) You see, even if the image is that small the brushes I use can really define it some more, but still it's better to use as big as possible render. Don't be afraid to use darker parts in the hair. Sometimes it's almost black when there's no light that can reach that part like in the neck area, just behind the head or when light comes from the left the hair is usualle very dark on the right back of the head. Or when one lock of hair falls over the rest it will leave a very dark shadow and when you define that you'll get a much more natural look already. I did this within 3 minutes so it's not like it's how it's suppose to be, but you can see that just by using smudge more and define it later with burn and some dodge you can make it just a little bit more realistic. But still, you did a great job and I'm sure within no time you'll paint better hair than I ever can. Jus watch out with the burn tool, don't overdo it! Set your exposure much lower and just go over it some more instead of high and burning too much at once. It just takes time. Hope I helped you out a bit. But again, great improvement you have made already! Compliments! Johnnie...