I would hope that if someone had what you are requesting, that it would have already been shared here and that it would be up on the site somewhere. Recently there were some new photos from the 1970's that were posted to Getty. They looked to be early head shots or just a very early photo shoot. They are posted in the Misc Photo thread on page 48.
Hi, I saw them they are amazing! Hard to think they are actually him. I knew someone who went out with a girl whose claim to fame was she dated Brosnan and she said he was really good looking but didn't have as good teeth as he does now. You can see that in those pictures. Also he is more tubby.