I guess that the stock itself ruins the sig. You choose the wrong stock. The background is white and it will of course blends the background of this forum, when you place it as you sig. So you need to have a border. I suggest having a black border will ruin too, so I suggest have a light color that matches the sig and low the opacity.
Overall, the sig is fine. The effects you applied on the sig should be more prominent, what i see is just a simple brush. The color is awesome, good choice for color!