The wallpaper is of an classical guitar and the focus is on the fretboard and shot while someone is playing. So we see the fingers on the fretboard. We can see a bit of the body of the classical guitar and we see the soundhole and a bit of the saddle of the guitar if we look between the fingers playing.
Now I can't tell from the picture what make the guitar is. So you're guess is as good as mine. Not seeing the headstock of the guitar and only having the inlay on the soundhole to go by makes it very hard to guess. Still, it's a nice HD wallpaper.