add more effects, maybe blend a c4d in there somewhere, but DO NOT just stick it on, try to get some 'flow'

Also, try to get the lighting right, the render has light reflecting off of it, and there is no light source in the sig, try to add one.

They are 3d abstract renders that are used to add effects and flow to signatures.

Try completing this tutorial, just concentrate on the techniques and design of the sig, don't worry too much about the end result.