Hi guineawolf,
Your shotted pictures will be stored in the .tga format in "C:\Program Files\Activsion\Rome - Total War\tgas". Unfortunately, before hosting them here, you need to install a piece of software to convert them. Although Infranview is the most popular, other programs can be found by simply searching google for tga converter. Open them up using your selected program and change them to either ".jpg", ".jpeg" ".png", ".gif" ".bmp", ".tif", ".tiff" or ".swf" to be able to host them on ImageShack.

After you have done that simply follow my instructions in the first post to host your images.

Hope this helps, cheers!