How to make it look real, that’s probably the biggest question on here…
I’d the MAIN thing you need to get right is your lighting. For now, you can forget post process and even what material is on everything. Lighting is your main issue.
Are those chandelier lights real? ( do they have point lights in them? ). Give this a go
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Remove the chandeliers for now.
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Have only a directional light and a skylight.
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Set the skylight to stationary, directional to about 5 and then build light ( even though you’re not using static lighting ).
I think that would give you a starting point.