a screenshot is added "automatically".
example: http://www.hwbot.org/submission/2179600_turrican_reference_clock_p4c800_e_deluxe_353.19_mhz
as you see, under "verfication link" is the cpu-z link and to the left is a "verfication image".
atm, this function is a bit bugged, because when you click on the "verfication image" it's ""http://valid.canardpc.com/cache/screenshot/853559.png.jpg"".
the ".jpg" is too much. once this is fixed you will see that screenshot -> http://valid.canardpc.com/cache/screenshot/853559.png
it's ok then.