Slightly quicker way:
Find photo, no need to sign in. Right click, on Firefox click 'copy image location', on IE click properties and copy the photo's URL.
Then stick it between the IMG tags on here, and remove the bits in bold:
http://newimages.fotopic.net/?iid=yut1j3&outx=800&quality=70
The new may also be a number (it used to be, I haven't used Fotopic for a while), also the 5 letters between the '=' and '&' will be different each time, but its those you want to keep.
Then add .jpg to the end, giving you:
http://images.fotopic.net/yut1j3.jpg
Then, fingers crossed, your pic will work 🙂