^cant really add that much to what they said, but the purpose of tuts are to teach you things you might have never known, a technique or effect, not to follow it word for word.

the sig lacks concept and composition. you have no lighting source, if you look at the render, the lighting is coming from her left (the sigs right). you need to work on creating that lighting.

i understand you want to be unique, i think everyone does, but in order to find your own style you need to understand others styles and techniques, this will make you better.

keep working and posting, gl