This is a picture that i took in my room, under completely no light condition , Without photoshop or any editing, i made this image only by using a torch and a DSLR . 

By setting the shutter speed of my camera very slow ( about 10s) , I could have enough time to trace the edge of  the guitar with torch, camera recorded the light and left the rest of my room dark . 

The traces of light with reflection from the wooden floor,gives a glorious feeling to the guitar and shows the dynamic of the music.