I need help recovering a gamer tag picture for my xbox360 ?

So me and my brother were playing gears of war 2 and we passed it on hardcore and we both got a picture but mine never showed so I changed his picture to see if I could get it but didn't let me so I tried to put it back it didn't let me and now my brother is mad at me if you can please help?I need help recovering a gamer tag picture for my xbox360 ?did u check on your awards or just go 2 system settings and go 2 pictures and it shuld b there and if u have live add me im lookin 4 freinds nd im tryin 2 get 2 a 100 freinds my gamer tag is acivic player all lower case. ;D