Help - Please

I am not sure I am even in the right place but I am DESPERATE for help.

My most beloved Kitty girl had to be put down the other day and I SO want her photo as my desktop.

I took an old photo of her and cropped it and went to (on Iphoto) share and set desktop and I had it perfect. THEN I played around with other photos of her to see if I liked them better and when I came back to HER photo and did a set desktop it was WAY too big.

I went to the original on my camera and transfered it to I photo - fixed it and did a set desktop but STILL it is way to big.

THIS means so much to me. Can anyone help me?

I am marespooscats@mac.com