The idea behind it is okay. I understand that it's your first time making a wallpaper and I know how much of a pain it is to work on huge pieces like this, but the thing kinda looks half-done. The white brush spatters look a bit messy and raw - kinda like random white paint spatters. You gotta play around a bit more with those - color, blur it (to make it "glow"), etc.
The color of the background, as it is, isn't that appealing. Then again, with the right components, you could definitely change that. Kinda reminds me of default Windows Vista background.
Last one would be the text. It's where a lot of people have problems with so it's perfectly understandable. But you really need to play a bit more with it. Clipmask pictures, colors, placement, effects..there's a lot of things you can do with it.
All in all, it's an 'okay' wallpaper but you really need to practice more on smaller ones for now.
Keep it up
