Webshots http://www.webshots.com/ works fine free version available.
Flickr http://www.flickr.com/ also good with a free version
I use both, probably Webshots more as I have used it longer But both will
provide a url that you can add to a message. below is an image from Flickr
at medium size

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2009 Ranger XLT Supercab 4X2 Vista Blue 4.0L SOHC V6
5 Speed Auto. Owner applied custom striping. Spray in bed liner, Remote Start, White Night aux backup lights, Ford LED logo brake light in receiver. My other vehicle is a 1977 Mercury Cougar 4 door