How can I safely search for elegant adult nudes without the search yielding underage and hardcore images?

I'm working on using Boolean search logic with mixed success on Yahoo. I gave up on searching for beautiful nudes in natural settings on Google. The purpose of my search is to find models to use for drawing, watercolor, oil and sculpture. I find inspiration with the beautiful female form. Thank you for ideas or assistance, Lionel.

Deviant Art has some great tasteful images.
go to www.deviantart.com
then browse
then follow the easy sellection tab
Categories
Resources>stock images>model>
>Female>nude> Formal/Classical
or
>Male>nude> Formal/Classical
These are stock art so the models understand that you are using the images to create art, many have some rules on their page but most aren't intrusive.

VTG Pre War LIONEL Lines TIN TRAIN No 654 SUNOCO OIL Silver GRAY TANK CAR
VTG Pre War LIONEL Lines TIN TRAIN No 654 SUNOCO OIL Silver GRAY TANK CAR
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1988 Lionel 6 17873 LCCA Convention Ashland Oil Tank Car 3 Dome Loose
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$79.00
Time Remaining: 1d 18h 51m

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Lionel 455 Oil Derrick and Pumper
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$16.99 (1 Bid)
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LIONEL TRAIN O GAUGE HOOKER GATX OIL UNIBODY TANK TANKER CAR 6 17909
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LIONEL TRAIN O GAUGE TEXACO GAS OIL UNIBODY TANK TANKER CAR 6 17904
$16.99 (1 Bid)
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Lionel Linex Gasoline Tall Oil Tank Item No 6 22953
$5.50 (2 Bids)
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LIONEL TRAIN O GAUGE CHEVRON OIL GAS UNIBODY TANK TANKER CAR 6 17901
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LIONEL TRAIN O GAUGE ATSF SANTA FE OIL GAS UNIBODY TANK TANKER CAR 6 17900
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Dual sided Billboard 1956 Kelloggs CEREAL PREMIUM Morton salt motor oil Lionel
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Time Remaining: 1d 20h 38m
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Time Remaining: 2d 8h 52m
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$34.00
Time Remaining: 2d 9h 55m

Lionel 12848 Red Gray Oil Derrick MINT NOS
Lionel 12848 Red Gray Oil Derrick MINT NOS
$75.00
Time Remaining: 2d 10h 3m
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Lionel New Parts 2305 45 Oil Derrick Circuit Board
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Time Remaining: 2d 10h 7m
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Vintage Lionel 6035 Tank Car Sunoco Oil O Gauge + Box Train
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Lionel Linex Gasoline Wide Oil Tank 6 12954 NIB
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$30.00
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Lionel 12902 Marathon Oil Derrick MINT C10
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LIONEL STANDARD OIL CO CHEVRON SINGLE DOME TANK CAR 6 9153
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455 47 BUBBLE TUBE FOR LIONEL TRAINS POSTWAR 455 OPERATING OIL DERRICK TESTED
$14.50
Time Remaining: 2d 16h 59m

LIONEL TRIPLE DOME TANK CAR SCOUT OIL COMPANY 36153 O O27 GAUGE
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3 VINTAGE PLASTIC LIONEL O GAUGE TRAIN CARS CABOOSE COAL TENDER OIL CAR
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