What is the main difference from da Vinci's Last Supper and Andrea del Castagno's Last Supper?

Answer 1

http://images.google.com/images?hl=en&as_epq=&as_oq=&as_eq=&num=10&lr=&as_filetype=&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images&q=%22last+supper%22+da+vinci&um=1&ie=UTF-8&ei=k8KNS57lMpTyMrjLnG4&sa=X&oi=image_result_group&ct=title&resnum=1&ved=0CBUQsAQwAA

and

http://images.google.com/images?hl=en&num=10&lr=&ft=i&cr=&safe=images&um=1&ie=UTF-8&q=%22last%20supper%22%20Andrea%20del%20Castagno&sa=N&tab=wi

Let us know what you see! I see many, many differences.

Answer 2

Read about Medieval Art (especially the 4th paragraph) to gain insight into del Castagno's work:
http://www.answers.com/topic/medieval-art

Read about Renaissance Art to gain insight into da Vinci's work:
http://www.answers.com/topic/renaissance-art-1

Answer 3

Contrast Tintoretto’s The Last Supper with Leonardo’s Last Supper. In your post, include the differences in media as well as thematic substance.