shallow focus photo of green snake

The photo is a handheld shot with my canon 5D mark iii using the canon 75-300 f5.6 lens. This snake is actually behind a glass window which made it hard to photograph. I had to position myself multiple times before i could get a decent shot without the reflections on the glass. Another interesting aspect of the photo is that these are pretty lazy creature in captivity at least there fore i had to wait a long time for the snake to lift it's head just enough for me to capture the shot.