"The Madonna and Child with Saints"

In the latter part of his career his works became notably more conservative and traditional, with many, including Madonna and Child with Saints, relying on a more simplistic bilateral symmetrical composition than one saw in his best earlier works. Moreover, the quality of the rendering of the figures is markedly less impressive than in his earlier works, indicating that significant portions of these later works were delegated to his assistants. That having been said, Michelangelo held this work in high esteem; a view supported by Giorgio Vasari,an Italian Renaissance painter and architect, who is best known for his work Lives of the Most Excellent Painters, Sculptors, and Architects, considered the ideological foundation of all art-historical writing,Vasari  argued that the painting was final proof of "the considerable importance of [Signorelli's] contribution to the development of Italian High Renaissance painting".

who argued that the painting was final proof of "the considerable importance of [Signorelli's] contribution to the development of Italian High Renaissance painting".