Page Rank website promotion needed

I have a photography site.

I will provide a few keywords. Used to rank in all search engine on 1st page and it was PR5,

not it drop to PR3 ( and I have no idea what had happen ).

I need to boost it back to PR5 and I need to have my few keywords back to google result 1st page.

Tell me what you can do. I'm not a beginner in SEO. Expert only please. :)

Skills: Internet Marketing, SEO

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About the Employer:
( 73 reviews ) Thornhill, Canada

Project ID: #221456