There is no focal point or depth to the background, the colour don't suit the render at all. The text is hard to read as there is a lot of white on the BG. The render does not suit the rest of the signature. I mean a Gothic font with Kirby? You need to work on blending renders or just choosing a different one.
Feathering wouldn't really work. Maybe duplicating the C4D layer 3 times and setting the top to gaussian blue of 4px on lighter and the middle to soft light, then lower the opacity of the one on the bottom. Just try variations of that.
Yes, we highly support people to help others. The benefits are that you can post you'r works here, then get them rated, so you'r skills will improve. I'm on GFX forums for that, I think I'll leave that for there thanks.