I am a huge fan of these books by Mike Venezia. We use them to introduce a new artist or composer in our picture & music studies.
This book about Chagall was entertaining, very vibrantly illustrated with both artwork by the author, Chagall, and others who inspired Chagall. The book gives a mention to how the Chagalls left Russia for France and in the next sentence France for the US. It doesn't mention the beautiful stained glass windows that he made for St. Stephen's in Mainz, Germany or the full meaning behind those windows going to the former Nazi regime.
All in all, a good intro, mostly for the 5-8 year old range. My 10 year old enjoys them, but wants more when we're done.