Firstly, let me say that to do this all in Photoshop alone is pretty cool. I don't use Photoshop but I know that I could not have done anything like this in PSP. I was wrong in my assumption.

Its the 45 degree streaking in the bottom left bit. Lots of ridges all in parallel. I really don't know why they are there except that I have seen a lot of this sort of thing from using fractal math as a method of generating the randomness. Maybe the cloud filter is the culprit. Do you have any idea ?