It's a good attempt mate.

I think when you make a signature you should consider some basic design rules.

1. Lighting - the lighted area within your piece, i don't see any lighting here.
2. Flow - the direction of movement a signature shows, in this case your have minimal flow
3. Color coordination - make sure your colors coordinate and blend in together. Ex: blue and purple. your colors are nice, but the symmetry of the colors don't blend at all and they don't coordinate quite well.
4. Depth - a bit harder, don't worry about it for now. it's just how your piece pops and looks/feels 3D.
5. Effects - I can see you used some C4D's and attempted smudging, but you should read up on some tutorials on smudging first and make sure your C4D's don't fully pack your background, they aren't meant for that.


Kiu!