It's quite good for a beginner signatuer. But the text completely ruins it.
In my opinion, you should never use a Stroke effect on text if it's above 1px. Or it draws too much attention to the text.
The render of that robot, hasn't got any effects done to it. It's just placed in the middle. You should start using effects, by duplicating the render like 8 times and do effects to them.
The background is good, not sure if you made it, or if it's just a image. But you should use a gradient map, to make everything blend better.
Overall 5.5/10. Keep making signatures, practise makes perfect.