Most pictures that get uploaded on other sites are usually found door fans and are then geplaatst on here, but u could always try places like Tumblr, Photobucket, ect.
If you're starting to collect pictures, I'll start u off! ;-)
I think that the best way to find loads an nice Johnny Depp's pictures is to zoek in Google (Images) "Johnny Depp",and you'll find his best pictures all together!