You can have as many domain names pointing to the same location as you'd like, but you should use permanent/301 redirects to tie them together. Try visiting: http://forrestcroce.com, http://landscapephoto.us, and http://valhallaphotos.com. Try them with and without www subdomains. Or, to save you the trouble, they all go to the same place, but you'll see the first url in the address bar, no matter which you come in through.
What might happen otherwise is one domain being seen as the content producer, and the others looking like mirrors at best and scrapers at worst. The first don't provide any value from a search engine perspective, so just don't show up in the results; the second makes the search engine look bad, so they take a harder stance. That's in a perfect world ... spiders crawl a page here and a page there, so they could discover one page on one domain and a different page on a different domain.
One way or another, they'll be filtered out for duplicate content, and it'll be the same as if you only had one. ( It'll take a while, by the way. ) By using redirects, you can choose which one, and combine any page rank - not that the stuff is that important overall - pages on each domain name may acquire.
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