Hey that looks like a nice wallpaper but honestly it's a little small for my taste. You should point out that the download button contains a bigger version than your preview.
I really like the clean line art you made. It's simple minimalistic and doesn't take too much space in the screen which is good for a wallpaper.
Your composition is very centered, but it's saved by the 4 icons in size yo have in the lower right corner. If it wouldn't be of those Icons, I think it wouldn't be that good. It's a weird way to apply the 1/3rd law buy it's working nicely