A lot of photo websites won't let you live link to an image (IE: access it from another website), because what would happen is that a lot of websites would dump their images there, and no longer have to pay for traffic bandwidth for that image, photoshop.com or someone else would do it.
Only downfall to tinypic and the rest is a limit on the amount of times it can be viewed.. For a vanity, it's fine, but a big thread, it'd run out of views probably within minutes.