Currently there is no way to move pictures from your computer to your handheld as far as I know. There is no feature in the device manager which will alow this. Two ways would be as described above by e-mail or then post your image on the internet using a free web host then navigate to the desired image using the browser in your handheld.
With the 7100i I have found the same issue about the pics. But if you use media manager in the Desktop software you should be able to get them, on other blackberries of course.