Thanks to The_Other_Other for another photo of Sun and the numbers, I've enlarged them and made a negative to try to aid viewing.
(Click to Enlarge)
Thanks to Cecco for decompiling all the photos below.
Today I've just found all the original images of the losties. The picture of Sun: it's the back of a polaroid photo and it shouldn't show an image.
There are some numbers, as the original polaroid' photos. I think there are: 1 2 5 3 1 0 6* 5* 0 5* 0 (the numbers with * aren't so readable) and on the right "polaroid 3". In some polaroid photos on the right is the number 32.