thats a nice photo.
I have a city and guilds in photography and can give you a few tips.
1, you can crop out all the bits you dont want in the picture like at the bottom of your pic you have part of the viv out its out of focus and distracts from the snake.
2, looks like your camera has auto focus also, that normally makes the camera focus at the center of the image, turn that off and make your point of focus the snakes eyes.
really nice pictures good luck with competition