Here are some websites to help you with your artist reports. Please share any other resources you find in the comment field!

General Resource
Multnomah County Library’s Homework Center list of art history websites
http://www.multcolib.org/homework/artshc.html#art

Jacob Lawrence
Meet Jacob Lawrence at the Whitney Site
http://www.whitney.org/jacoblawrence/meet/index.html
The Jacob and Gwen Knight Foundation
http://www.jacobandgwenlawrence.org/
Jacob Lawrence at the Madison Museum of Art
http://www.mmoca.org/mmocacollects/artist_page.php?id=19

Pablo Picasso
The Online Picasso Project
http://picasso.csdl.tamu.edu/picasso/
Picasso at the Art History Archive
http://www.arthistoryarchive.com/arthistory/cubism/Pablo-Picasso.html
The Picasso Administration—This website can be hard to navigate, but is a neat experience just to check out. Make sure to click on the button for English.
http://www.picasso.fr/us/picasso_page_index.php

Marc Chagall
Wikipedia’s page on Chagall
http://en.wikipedia.org/wiki/Marc_Chagall
Chagall on Discover France
http://www.discoverfrance.net/France/Art/Chagall/Chagall.shtml