They actually do go in. Rivets are just like nails in that sense. They are popped into the metal to hold them together, therefore causing a dent around the head of the rivet. The head may pop out a minute amount, but the dent that it creates would be more visible.
In that sense, I'd say its just about perfect. Only thing I can see that I would change is the panel lines. IMO, they may be just a tad too dark.