First, remove that double font, the big one behind can be left out. You created some nice depth there and I pretty like the right side, the left looks okay, too. Simple structure and effective. Well, somehow there is something missing, you have no light source and the flow is hard to consider, you might add some more c4d renders although they could destroy the right side. You can even try adding some effects by using rendering filters and maybe some gradients (b/w radial on soft light always adds a nice focus on the render). :>
I can't tell what the render is T_T. I don't think you need that double font at all, I'm sure if you removed the larger transparent one it'd look a lot better. The signature has a nice flow over all (in my opinion,) so over all I'd say you did a great job.