Hmm.. 106KB? Bit big.. Wont be able to use it here thats for sure..
the backgroud pattern you have used makes the sig look like a bad quality GIF
The manc badge looks faded/poor quality
Overall the sig looks bad quality.
If you remove/change the lined and dotted background would maybe make the sig look a lot better.
Make the opacity of the Manc badge higher so its a little clearer, that goes for the text aswell
But I must admit, its not a disaster of a sig, just try and do these little things to it and it would make it look a lot better.
Also, if you are using Photoshop (Which I assume you are) Try "File -> Save for web" Im pretty sure this reduces the file size.
Well done for the attempt