well, you can do this two ways without photo bucket or anything similar...
simplest is to use an attachment.
Upload attachment, open attachment, right click attachment, copy image url, then paste it into image tag.
Second easy way is to just upload pics to your FB, then copy the image URL and paste it into the image tag...
And since I didn't see it here, you just press this button
then paste the image url and you are all set.
And if it wasn't clear, right click on any image, you will get the copy image url option. Some sites will try to block from doing that, but there is always a way around that.