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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LIONEL Skelly Oil Tank Car o gauge train car 6 36105 from Set 6 30050 NIB
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Lionel 455 46 Oil well new old part
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Lionel 455 31 Oil well new old part
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$20.00
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LIONEL 3 DOME TANK CARSCOUT OIL COMPANY 36153
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Replacement String for Lionel Cranes  Oil Derricks Qty4
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Time Remaining: 3d 15h 57m

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Lionel Mobil Oil Single Dome Oil Tank Car 616127 NEW IN BOX UNOPENED
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$32.00 (16 Bids)
Time Remaining: 3d 17h 2m

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Lionel trains 455 Oil Derrick and Pumper In Box
$165.00
Time Remaining: 3d 17h 6m
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Original Lionel postwar 6465 Sunoco 2 Dome Oil Tank Car w Box
$9.00 (1 Bid)
Time Remaining: 3d 18h 26m

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Lionel 455 Oil Derrick 1950 Version Superb Condition
Lionel 455 Oil Derrick 1950 Version Superb Condition
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Time Remaining: 3d 18h 48m

Lionel Prewar O Scale Shell Oil Tank Car 2654 C 7
Lionel Prewar O Scale Shell Oil Tank Car 2654 C 7
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LIONEL MULTI PURPOSE LUBRICANT for model train lube grease oil gear 6 62927L
LIONEL MULTI PURPOSE LUBRICANT for model train lube grease oil gear 6 62927L
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Time Remaining: 3d 21h 21m
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Time Remaining: 3d 21h 48m
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LIONEL 6 28099 GREY TWO TONED UNION PACIFIC CHALLENGER 3977 STEAM ENGINE W OIL
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