I'm not really liking it. I think its a bit plain and your stock is a bit smudged which looks off for this sig (Especdially where you smudged his blue overalls). The background is fine, but I would recommend doing something else besides those squares. Also, the text is a boring font to use with your theme and a terrible color choice.
I would focus a bit more on the text and stock the most, they really need you attention. Make your stock sharper, or if you are going to smudge it, have the smudge look better and flow with the background. Also, have fun with your text, really mess around with it, make cool text yourself or download some. A border would probably improve your sig a bit too.
The reason your text was blurred is because you uploaded it is a jpg. When saving, change the format of the file to a PNG (my favorite). It makes it withstand uploads and is very versatile. It maintains great quality no matter what you do with it. JPG tends to blur or pixelate really badly upon upload.
Here's A Screenshot I just took so you can see:
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