First, adding the logo of the anime adds little to the piece.
Second, your job of cutting out the images could have been done better. Try to use the path tool to create lines that follow the character, the magic wand isn't effective at getting that bit of white in armpits and places where hairs meet.
Third, that star in the background is a bit cut off on the side, try making a copy of the left side and flipping it.
It seems one of your background stars is on a layer above the character and a piece of it is covering a line from the hair. This is creating a discordance about which of the parts of the image is the focus.