I'm guessing you used the image from the link to DSiBrew to make that? I tried copying that to my card and it worked, so transfering images between DSis appears to be possible. I did a right-click>properties>details(on windows vista) on the one you put up and the one from DSiBrew, and found some differences you may want to look at Under the Origin catagory, the entry for "Program naby jotokun - Offtopic
I just tried it - it didn't work. It shows a grey image with a question mark, and the text "Cannot display image".by jotokun - Offtopic