Ok so i tried fixing everything you said Dekodere.The colors look a lot better now but the light hair color you suggested looked more grayish than brown so i kept the old one. I tried making the navel from another picture , is this how it should look like?
Thank you for all the help.
Higher res:
https://www.dropbox.com/s/phgkmdsxof5cppv/HotaruFinal2.png?dl=0 