browna - I'm going to be completly honest here
Firstly, when you're making a sig you want the colours to blend nicely with the render, in this case neon pink, blue and green just don't work. I may be wrong, but it appears that you just put a pink-green-cyan gradiant on then slapped 2 or 3 C4D renders on with various blending options. This is a good start, you just need to try and:
1 - Choose a more subtle gradiant and colour scheme
2 - Work with the C4D renders to develop a little flow and blend them a bit better
3 - Try to add a border and lightsource, it takes a minutes and will help a lot
I did a quick one with this render