Well... I have just began in this but I would like to show my improvement.
New sigs go upwards (and, obviously, old sigs downwards xD):
Thoroughly Blue: I think this is the best I've ever made. The artwork used was a bad qualited scan and that annoys me, but that pose wasn't in any other better qualited image then.
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Espada: Signature featuring Ulquiorra, character from Bleach. With a black background it fits better because it merges with it by one side.
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So the crow told me: I hate the fonts in here =_=
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Grant me a wish: it is a little bit empty, but I like the colour changing through the signature.
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Sound of glory: *o* I love this signature.
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Sky pirates [Fran+Blathier]: two signatures made to practise. I prefer Fran's one ._.
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D.Gray-Man [Allen Walker]: I love this signature, even I realized that it is too much wide.
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Dust: it is made for a black background. I don't like it very much =_=
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Japan Style: it's strange, but I like it o.o
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Okami: I think it is too much dark to be Okami.
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Bullets & Carnage: simple, but I like it o.o
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Final Fantasy XIII: The same style that the previous sig.
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Fire Emblem: the Goddess of Dawn: Using textures for the firt time.
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The exorcist: First signature ever Ô.o