Well if it's just that one pic you're interested in, I've got the trick for you. Copy the URL for this small pic, and just edit the "size letter" for the address to see a different size! (If you don't know how to get the URL for an image, you don't belong reading my prose! But here's how: download Firefox from getfirefox.com, install it, go to the page with the pic, then right-click the pic and select "Copy image location")
For Myspace: s, m, or l...
http://a766.ac-images.myspacecdn.com/images01/8/s_80c85848d4eb5bba0e747be8ddcc7b7d.jpg
http://a766.ac-images.myspacecdn.com/images01/8/m_80c85848d4eb5bba0e747be8ddcc7b7d.jpg
http://a766.ac-images.myspacecdn.com/images01/8/l_80c85848d4eb5bba0e747be8ddcc7b7d.jpg
For Facebook: q, t, s, n...
It's not as useful as the Myspace trick, since you can't really get to the "big" pic, and the letters are way harder to remember (sQuare, Tiny, Small, Normal ??) but still kinda neat
http://profile.ak.facebook.com/profile5/1982/19/q23331275_3878.jpg
http://profile.ak.facebook.com/profile5/1982/19/t23331275_3878.jpg
http://profile.ak.facebook.com/profile5/1982/19/s23331275_3878.jpg
http://profile.ak.facebook.com/profile5/1982/19/n23331275_3878.jpg