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.

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NEW 455 53 METAL SUNOCO OIL DERRICK SIGN FOR LIONEL TRAINS 455 P
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Synthetic Train Oil For Lionel Slick Liquid Lube Bearings C 10 Mint Brand New
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LIONEL 12902 OPERATING MARATHON OIL DERRICK ACCESSORY
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$6.99 (1 Bid)
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Lionel 6 9152 Shell Oil And Gas Tanker car Orig Box Mint condition
Lionel 6 9152 Shell Oil And Gas Tanker car Orig Box Mint condition
$9.99 (1 Bid)
Time Remaining: 1d 22h 7m

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LIONEL LIONEL OIL COMPANY DERRICK 12848
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lionel o gauge 12912 operating oil pumping station new in box made 1995
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Lot of 2 Lionel Lines O Scale Tin Plate Sunoco Oils Gas Tank Cars 1680
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Lionel O27 Gauge 1946 2465 SUNOCO Double Dome Oil Tank Car
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Lionel O Gauge 1953 6415 Scale Modeled SUNOCO Triple Domed Oil Tank Car
$9.95
Time Remaining: 2d 3h 23m

Lionel Pre War 2654 Shell Oil Tanker Car In Original Box See Our Other Trains
Lionel Pre War 2654 Shell Oil Tanker Car In Original Box See Our Other Trains
$24.99
Time Remaining: 2d 4h 16m

Lionel O Gauge No11957 Mobil Oil Steam Engine  Freight Car Special Set In Box
Lionel O Gauge No11957 Mobil Oil Steam Engine Freight Car Special Set In Box
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LIONEL 455 23 OIL DRUMS 5 TOTAL  SUNOCO OIL DERRICK NO 455 SIGN LICENSED
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Time Remaining: 3d 30m

Rare 1933 1942 Lionel Gas Sunoco Oils Tank Car 1680 In Tin Plate O Scale
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