It doesn't look like it has worked to me, you need to find the image's direct link. You can usually find this by right clicking the image on the page and selecting "copy image URL" or "copy image location". Paste that into the profile picture field while editing your profile and it should work fine.
Make sure it has the image type at the end of the link, in this case, .png. Example:
http://www.opticraft.net/Themes/Opti/images/logo_1.png