this site isnt the best for art but what i found usefull where the skull of each animal ... there is a drop down menu ... you select for example human in brings you to a skeleton .. you use the drop down menue to select for example male cranium and it will pop a new window with a picture and 4 views are available from a drop down menu onlu fron back side and bottom there are jaws and each individual bone for most of the bones of the body
http://www.eskeletons.org/