Create a new layer then change the foreground color to white then select the brush tool. Change to a 2px, 0% hardness, 100% opacity round brush. Now select the pen tool and draw a curvy path that kind of wraps around the girl. Then right click on the document and select Stroke path and make sure simulate pressure is unchecked.
Now pay attention to the next two steps as we will be doing the same thing a few times from now on. First Ctrl+click on the original girl's layer then select the layer with the curvy line in it then Alt+click on the layer mask button at the bottom of the layers panel (cirircle within a rectangle button). You'll see that the line now goes behind the girl. Now hit Ctrl+D to deselect.
Now we want the line to go over and under the girl layer. So select a a hard round white brush about 50px diameter and 100% opacity. Select the layer mask on the line layer then paint on the parts that you want to appear above the girl, I painted on the parts that I've circled in red. Next we want to fade out parts of the line, mainly the ends and the parts that we want to appear far away. So change the hardness of the brush to 0% and the opacity to about 20%, also change the foreground color to black then just brush over the parts you want to hide a few times.
Now right click on this layer and go to blending options then add an outer glow using the settings shown below. You can repeat repeat these steps to add a few more lines, I just left it at one.
Now we're going to put in some abstract renders so open one of the renders in the pack that you downloaded then drag the render layer into your original document, you may have to minimize the windows within photoshop. Most of these renders come with the render layer and a background layer, just put the render layer in then close the document. After you've dragged it in then scale and move it until it is placed over the girl like so.
Now we use exactly the same masking technique we used for the line, basically do steps 7 & 8 for the render instead of the line, notice how most of the render appears behind the model but some parts appear in front of her. Remember to fade out some parts of the render too, especially since there are some sharp edges in some of the renders.
We want to go for a reddish pink color scheme so if the render you used isn't the right color then go Image>Adjustments>Hue/Saturation then change the hue slider until it looks right, I had to do it with the first render I used, so look at the difference.
Now we have to do exactly the same with a few more renders. I used three in total. It is important that the renders look like they go in front and behind the girl to add depth. This is what mine looked like after I added two more renders.
This step I guess is optional, if you want to add some more stock images into your piece then now is the time to do it. The process consists of pasting in an image, masking it like we did with the girl then scaling and positioning it in the image. Some ideas are flowers and plants, small airplanes or balloons etc. I added a couple of flowers but you can put in more or none at all.