try duplicating the layer of the girl, then play with the blending options, like overlay/screen/hard light etc. then play with the color overlay and things like that, to give it a slight purple/red hue. also try and match her better with the lighting of your background. try out filters > render > lighting effects
take a look at these i made:
i tried to match the lighting so they stand out, but not too much from the background as a whole.
just experiment, until it’s how you want it. i usually spend a good portion of the time on my work just messing with lighting/shading and coloring alone.