Mostly female pose reference in fantasy-ish and steam punk costumes. Some nude or near-nude.
http://mjranum-stock.deviantart.com/gallery
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Photo collection of hairstyles, grouped by length, gender, and special occasion.
http://www.hairfinder.com/hairstyles_pictures.htm
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Large photo collection of birds, along with other nature related themes.
http://mydigitalmind.deviantart.com/gallery
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Organized reference of military aircraft, small arms, etc.
http://www.militaryfactory.com
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