Hm.. the fourth one is what GFX'ers call a smudge signature, and that's how they usually are. Though 'too blended' is something I can take as a compliment.The third one is a vector sig' with barely any eye-catching colour, or is it my monitor setting? I'm surprised, I hated the parrot myself not because it was too plain. I've noticed you say that for most clean sig's, maybe because you're used to noise in your own work. I find it so that beauty is usually clean and natural, but that's an opinion. And what you called a flower stock was actually a basic brush.You have some good ones but some of your work is either on the borderline of too plain, or too blended. Like the fourth one... effects are boring and too blended... and the first one, the flower stock doesn't go especially the purple. Now on to colour... the third one's color is over the top, too much color usage. The only one that is actually really good is the parot one... even thougth its alittle plain the color's match, the text is cool, and even thought there are only alittle effects there are cool too.
The final one is actually the one I'm using.nice. You should add something more to the backgrounds of the second and final signature just so that they don't look so bare.