Please see the related link for a picture..
Leonardo DiCaprio's belly button is an innie. I've seen his belly button in This Boy's Life The Basketball Diaries Total Eclipse Marvin's Room Romeo + Juliet Celebrity The Beach The Aviator The Departed Blood Diamond Body Of Lies and Revolutionary Road. There are some pictures of him on Internet where his shirt is open and some pictures of him shirtless and one picture where his shirt rises just high enough so we can see his belly button.
Skin and a belly button? What else would it look like?
You'll have to go into the piercing shop and ask them to look at it. Everyone is different so they'll have to decide.
A hole
It doesn't look as attractive
No
Yes you can get it pierced. i have a half innie half outie too and it looks fine. if you don't feel that it doesn't look right when you get it done, don't worry about it just buy belly rings that look like this it should be big enough to cover your whole belly button :D Piercing the umbilical knot is a very risky thing, verging on dangerous. Most experienced professional body piercers wont do that piercing due to the high risk for infection and secondary complications. A navel piercing is the area around the umbilical knot, piercing the actual knot is not recommended or wise.
Belly button rings. If you look at your local jewllers, they should have some in stock for you to look at:).
No
I find it quite easy to sex hedgehogs. The males look like they have an out belly button on the center of their bellies, which is actually the penile shaft. Females don't have this belly button, obviously.
Look on the tummy. If you see a "belly button", then it is a boy. (Hint: it's not really a belly button) If not, then it's a girl.
It just looks like and over sized pore or dimple nothing to worry about.