Photo collection of hairstyles, grouped by length, gender, and special occasion.
http://www.hairfinder.com/hairstyles_pictures.htm
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Historically accurate costumes.
http://historicalstock.deviantart.com/gallery
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Reference photo library of costumes without a human wearing them.
http://www.osfcostumerentals.org/stock/index.html
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A very large photo library of wild life in the UK, or by UK photographers. Most, if not all, of which are properly named in either common name or scientific name.
http://www.wildaboutbritain.co.uk/pictures
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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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Mostly female pose reference. Lots of pose and view angle varieties, with many props but no costumes.
http://senshistock.deviantart.com/gallery
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Reference photo, man mostly, various costumes from military to fantasy to birthday suit. Cross-dressing galleries.
http://manstock.deviantart.com/gallery
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Human proportion calculator.
http://hpc.anatomy4sculptors.com
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The free tutorial video section of the Gnomon Workshop website.
http://www.thegnomonworkshop.com/store/category/171/Free-Tutorials-All
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Anatomy reference for both 2D and 3D. Pose, portrait reference photo as well as texture.
http://www.fineart.sk
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