To make my troll original, I added hair lines to his head.  Using the pen tool, I created shadows on him to make it appear like his arms are actually 3D.

Here is the final logo for Vero ECO friendly water.  The simple design makes it easily rememberable, and good for any size print.

The idea of a bottle being integrated into a tree came from the idea of an Eco friendly bottle made from a tree.  Black and white creates a settle appeal, and the green leaf draws the eye.