Brad,
This is an OK URL, but it's an URL to a "thread" (topic) not to an image. An image URL will look like:
http://www.modulus.com.au/images/avatar.jpg
for example, which points to my avatar (note the .jpg extension, referring to a picture, could also be .gif, .jpeg or .png)
You've got to get your avatar to a place on the net where it can be referenced like mine is in the example. This might be a "free space" server or might even be here, but I'm not an admin. or moderator here, so I can't offer you any space to host it.
If you have somewhere you can place it and then reference it, you should be able to put the resulting reference into the address bar of yr. browser and it should show yr. avatar (you can test that with mine, above). Unfortunately some browsers will work even with invalid characters such as backslashes ('\') rather than forward slashes ('/"), but this is still worth testing.
All onliqueness has been deliberately removed from this post and, on review, I might have been a bit severe with tassuperveee, who is, of course, one of the forum's gentlemen.
hth