☞This group consists of all kinds of people from every nation. The aim of this group is to create an enjoyable environment to be creative and having fun with what you do. This group definitely isn't just for people who like to draw, but for people who enjoy any kind of art. So, you can also a story or create some background music, whatever your skill might be. If there are any questions left, just write me a message and I will respond as soon as possible.
Beautiful bro!
EDIT: I think I figured out what techniques/brushes you used! :)
No brushes, at least, not for adding anything to the picture. It's roughly the same technique as in the Ultimate GIMP Planet Tutorial.
You start out with a photo of your choice, edit it into the planet by merging different images (if you wish anyway, sometimes 1 source image is enough) then you add a lens effect, grey-scale it and copy it to a new image where you add the colors, atmosphere glow and hmm... maybe spaceships if that's something you like to add. I for example added the sun.
So the way I made this image was: I took an image of some trees, stretched it so you got the base texture, the flowing lines. Then I looked up some photos of those storm formations and pasted that in.
After that I added the lens effect, added color,the starry background and then the sun.
It's worth mentioning though I did this at work while being slightly bored, and not really paying attention, so it's far from perfect. xD
Ah wow, because I thought those storms were a galaxy brush, seeing as I have one just like it :P
Nope, the galaxy brush in my opinion is a little squarish... Never really used it myself.