I know this is a really unprofessional answer, but I don't exactly remember XD. But there were a lot of brushes involved, many layers set to dodge and overlay for the brightness. A lot of smudging with the smudge tool. Merge everything, radial blur it and then erasing the unwanted parts. Um...sorry if I'm being confusing, I'm not good with giving directions >_<. I hope it helped at least a tiny bit?