Sorry, it's not technically possible. (If it was people could turn round a picture of you to see how big a bum you've got!).
All can do is to ask whoever sent you the picture to take a few more from different angles and send them to you.
^^^ That assumes that you actually want to look around the other side of the photo. If you simply want to 'straighten up' the picture a bit, save it to your hard drive and open it in any decent picture viewer. (Such as Irfanview
http://www.irfanview.com/ ). Then use the option to rotate it by a few degrees. (In Irfanview you go to Image > Custom/Fine Rotation)