We will be posting an official announcement on embedding pictures securely on our website soon.
For now you need to consider 3 things when embedding an image:
1. Use an image hosting site that supports encryption, there are many site out there that do but I personally recommend imgur since it's the easiest to use. Your image URLs can be HTTP instead of HTTPS as long as whichever site is hosting your images supports encryption, SLO automatically makes secure requests even if your URLs are insecure.
2. The second part of the first rule does not apply when you're using an URL shortener, some people use them because of the 300 character signature limitation. When you use these, make sure the original URLs that you're shortening do contain https, this is because SLO has no access to the original URLs and is therefore unable to make an automatic secure request.
3. Stay away from Photobucket or any site like it, Photobucket is the kind of evil that responds insecurely to secure requests. Most sites that do not support encryption will simply not respond or show a certificate error, Photobucket however will silently respond insecurely as if nothing is wrong, your images will show, but your connection will be infiltrated.
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