AI really want to practice faces and renoirs luncheon of the boating party holds special meaning to me, I can't find anything conclusive though as to whether creating and publishing my version on my website would be a breach?!

AOld masters aren't copyrighted. Some museums may hold the rights to items in their collection.

AAny unpublished work created before 1893 or published work created before 1923 is automatically in the public domain.

http://copyright.cornell.edu/resources/publicdomain.cfm