Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
First things first, do you have a better image? A tiny 72 ppi jpeg is no place to start if you want that image to look like the other examples you provided...Steve
The original image is fine for something like this. The provided examples on the other hand are either straight up "drawn" using pen tool etc in PS/ILL, or have been filtered, traced, and had nodes adjusted by hand after the fact. There really is no automatic way to get those kinds of clean lines based on a photograph that retain the right info in the right places and still look dynamic.When I approach something like this, I typically do something like this: