Vector graphics is the use of geometrical primitives such as points, lines, curves, and shapes or polygon(s), which are all based on mathematical equations, to represent images in computer graphics. 1
So vector graphics is a computer calculated graphic, the opposite of that is called raster graphics. The keyword for raster graphics, they are made of pixels. Like the photo you took from your digital camera.
When you change your photo into a vector graphic, you can get more artistic and you can use it for many things like your design brochure or even for your picture ID on your social network site.
But now you can change a photo to a vector, even though you know nothing about using those design tools above or when your local graphic designer friend is out of town. Just prepare your photo at your PC, click this site and upload your photo, after that ‘walking horse’ walla you get a vector graphics version of your photo, for free. Here is the site 2
My suggestions are that you prepare a relatively high resolution photo 1,5 Mega pixel above (a small 300 x 300 photo results blackness.
After you get your vector graphic-ed photo, save it then you can reduce the size of it and make it your id photo.
Hope this tip is useful for you. Wait for other tips from this site.
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1 Wikipedia , Definition of Vector Graphics
2 The Photo courtesy of 'Harvard Love Story' a Korean Hit Drama