Try sharpening your signatures. It can help alot but remember if you do, to erase parts of the sharpening to make a depth in your signature. :3 Hopefully didn't confuse you with that.
Also make sure you center your characters. I love what you have here, although the second signature is kinda obvious photoshoping xD but i like your ideas and your creativity. Try using some floral brushes or some patterns in your work. Also try looking for some tutorials, they really really help :3