Keyword Discussion Forum

I have couple of queries.

On a site I am doing I am targeting one keyword on all the pages (A persons name), my keyword density for each page for this term is between 3-5% which I am told is optimal.

But when I use a tool to check the denisty for the term sitewide it comes up way too much and says its 'spam' - Should I worry about sitewide density or do search engines just treat it page to page and not the site as a whole?

And I have a phrases query -

Say I am doing a famous actresses pictures page and the page denisty is optimal for 'famous actresses' and 'pictures' as two seperate things, but the actual phrase 'famous actresses pictures' is very very low, could I still do well for the term 'famous actresses' pictures'? (Im just talking about denisty here, I know there is a lot more to doing well like backlinks etc).

Thanks