3 artworks Progress From Flat State (byzantine)

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what is neededfor this essay is a discussion on development art work of:
1.barberini diptych, example of byzantine ivory work
2.Harbaville triptych
3.the ghent altarpiece ,also called the lamb of god (polyptych)
each artwork with one reference, please include citation,periods of time,and also page number perhaps, (cite artist/date/title)
response on each of the artwork, is there any similarity or resemblance on the 3 artworks, and also add argument for each critical response of the artwork progress from flat state ( byzantine) into greater degrees of naturalism. 
thank you in advance.