Hi
Not sure if this is a Topic someone else has covered but I just wanted to share some reference/ resources that I rate and think would be of use (if you don't know of them already):
Sculpting/modeling reference links:
http://www.anatomy4sculptors.com/
http://fineart.sk/
http://gotwires.blogspot.ca/
http://www.posespace.com/default.aspx
http://uglyoverload.blogspot.com.au/
HDRI and texture links
http://www.hdrlabs.com/sibl/archive.html
http://gametextures.com/
http://www.cgtextures.com/
Please feel free to ad/ignore
Jake