It makes it looked inflated, like a pillow.
'nuff said.
These look flat, like... medaillons or something... you also used pretty dark colours, makes it kind of... *ugly* in my opinion. And what's more, the slash ("/") looks more than bizarre. D:
And lastly, the blue fields do SO not fit in there.
In general I'd suggest to get off GB-style. It's nice to get started spriting with, but it's not a good style to go with in general. Too limiting.
Anything else that I didn't rant about is nice though. |D