1. Open a picture in Photoshop
2. Create a new layer and use the free-form pen tool to create the lines
3. Select the brush tool, change the size and in the brush pre-set menu change the pressure to pen pressure and make sure the colour is white.
4. Click on the path pallet, stroke path and select the brush tool.
5. Open the blending mode options and change the inner and outer glow of the line by editing the colour, size and noise.
6. Create another new layer and add in some more lines with the free-form pen tool over the original ones.
7. Click on the path pallet and use the same brush tool as before.
8. Lower the opacity of the line and add some Gaussian blur to give a blurred effect.
9. Add a new layer, click on the brush tool and edit the brush pre-sets.
10. Increase the spacing, scattering and size jitter to get a random sparkle effect.
11. Click over the lines created previously.
12. Open the layer blending options and play around with the inner and outer glow settings.