Looks good. Just put some depth in it though
1. New layer
2. image > apply image
3. filter > sharpen > sharpen
Now this is the important part is it will give your signatures depth and make them look a little bit less flat.
Since you're just starting we'll do basic depth.
4. With an erase set on 100% flow and opacity erase everything except the focal point (where your eyes are supposed to be drawn on the sig. In your case it'd be minato) Now if you feel like it looks a little odd compared to the background, erase it with an eraser set on 50% flow and 100% opacity. Click on the eye thing on the applied image layer (this will make it invisible click it again to go back to normal) and if you did everything right, your focal point should stand out more.
This will make your sig look less flat.