I think your intention is that the snake is confused with a tree branch, but it is a bit annoing, it looks as if snake, bird and mouse are falling down, making the bird flying will give this a lot more dinamism. Otherwise, great colors, drawing and idea.
You HAVE to make the owl flying, like he just hunted the snake. Better yet... A bald eagle. If you choose to leave it standing fix the damn owl. He has a strange condition right now. Also, agree on the scales on the snake. My .02.