your crushing teeth are the wrong way around, they only do damage on the darker side. And yeah if you're not going for a super real-life approach you need more weapons on it. If you are more into IRL looks, then the DSL mod may be of interest to you. It has a lot more components you can use to make your bot pretty. Ironforge is mostly about efficiency.
Wen is right though, the motors you are using for drive are really only meant to be used for weapons, as they have very high speed but low torque. There are dedicated drive motors, they say so in the description.