How big does a Lionhead Rabbit get?

I have a Lionhead Rabbit, he's not fully grown yet, and I was just wondering, about how large do they get, and does it depend on how much you feed them? What about their gender? How about if they're "single-maned" or "double-maned"? If so can you tell me if my rabbit is... show more I have a Lionhead Rabbit, he's not fully grown yet, and I was just wondering, about how large do they get, and does it depend on how much you feed them? What about their gender?

How about if they're "single-maned" or "double-maned"?
If so can you tell me if my rabbit is which?

Here's some links to pictures of him:
http://s141.photobucket.com/albums/r50/NeverCeaseToFly/?action=view&current=Phot4os0661.jpg
http://s141.photobucket.com/albums/r50/NeverCeaseToFly/?action=view&current=Photos6667.jpg
http://s141.photobucket.com/albums/r50/NeverCeaseToFly/?action=view&current=Photos005.jpg
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