I'm a freelance graphic designer and send .pdfs of my work via email... .jpgs can be a problem due to resolution and file size (which will be low/small for speed of emailing): if someone wants to 'zoom in' to look at a graphic detail: some typography, a logo or a detail of a page layout for example, it will look pixelated... not only will this display your work poorly, it will also show your 'lack of knowledge' about image resolution generally... not a good thing for a possible employer! What about creating your own website that you can provide the link/url for?
And as cas has said, embed the fonts in your .pdfs otherwise they will 'revert' to a standard nasty like Courier... yuk!
Good luck!