I'm not good at giving tips, but I'll try to do this more often.
I mean I don't like it. I do like the idea you were going for and could still use improvements.
I just woke up, so from what I can see at the moment. I think it could use a little more erasing on as far as the brushes on top of the renders goes.
Some blending with the background just a little bit. Maybe trying using some of the filters.
You could've made a copy of the render, put behind the original at liniar dodge with probably motion blur at the degree of the flow of the signature.
Probably -75ish degree.
I also understand how you were trying to create a different flow with the brushes and in my opinion turn out okay, but you could've used less and more erasing.
Don't really think this tag could use some color corrections.