Sorry for the late reply. This can be a nice op-ed piece. But as of now, the first section is not fully integrated into your argument in the second section. It can become more interesting if you focus on Passion–please explain in the beginning what it is about–followed by the development of the rendering of Christ.
If you were to include the first section, your argument on art and utilitarian objects can serve as the main thesis. In the Middle Ages, art and craft were conceived as one. You can then focus on one altarpiece incorporated into furniture/architecture. But in this case, you need to change the second part significantly.
I recommend making the highlighted sentence in the last paragraph as your thesis and focusing on discussing the paintings you mentioned.
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