I like the background very much, but it's low quality and you will find better images in the internet. I like the uniform and the fact, that the hair is not blue. Also the way you made the skin blue and the tone of the blue is good, but in die lower part of the face you can see a bit skin color.
But the border of the face doesn't look good, you should have removed it from the pic before. The Eyes doesn't look realistic, because its just one tone, it's a bit to inaccurate and there are no reflection, which are normally in eyes. I also tried to turn someone (Timothy Zahn) into a Chiss: There I kept the reflections in the eyes and made them red with an circular color gradient from bright orange to red. You could see my version of Zahn as a Chiss here: [link]
I hope i helped you improving your skills! Greetings Kerro