MrNice

The penis of a man who has been circumsized has no foreskin which is the skin which covers the glans or head of the penis.

The uncircumsized man has a foreskin which covers the glans of the penis until he is erect as which point the foreskin rolls back to expose the head or glans.

There are web sites where you can see photos of both circumsized and uncircumsized penises. Do a google search and I'm sure you will find some.