Here is how you improve your current sig.
1. Take the image, and make it the top layer, monotone is a style I now find fleeting.
2. Place your font in the center of your sig, vertically, and slightly to the right or left, based on the horizontal placement of the image. In this case, slighty to the right. Just imagine the space to the right of the image, as a rectangle, and put the text in the middle of the rectangle.
3. Add a visible border, preferably black and 2 pixels thick
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To rate this sig, I'd give it a 3/10