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I go for photo-art shots both studio as well as outdoor portraiture.
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For outdoor portraiture, you don't mentioned what shooting style you're looking at, e.g tight face closeup shots, medium head n shoulder shots, or even half body shots, or the more candid full length portraits, etc.
The Nikon AF-D 50mm/f1.4 (or the latest AF-S 50mm) is great for half body or full body shots. If you want something tighter (and willing to shoot further from your subject) then the AF-D 85mm/1.4 is great.
But for shooting photo-art, then you might want to consider a lens with closer focussing, e.g. the Zeiss ZF50mm/f2 or ZF100mm/f2. As these two are makro lenses, the focus close and offer pretty good images even when shot wide open at f2. You get the wonderful Zeiss colour and 'milky soft' bokeh when shot wide open.
I use both these on my D700. The quality and build of these Zeiss lenses are just the best there is. Do note that these are manual focus lenses but that's fine for portraiture anyway.
Got them from TK Photo (Richard) at Shaw Tower, Beach Road.
Fred