Id be on the side of no lamps, and instead a nice picture light instead and then add decor as mentioned above.

I had not even thought of a picture light. Thank you!

One lamp that, along with the buffet, comes to 58-64" from the floor. If you put the mirror there, as suggested in your other post, then you may want two lamps. Those can be chosen once you decide on the wall decor.

If you end up with one lamp, the Squarespace one that @Maureen posted looks nice

JUST IDEA

IMO you should select some objects that pick up the black in the canvas to weight the top of the sideboard.

Buffet lamp should be tall but narrow

An assemblage of different size black ceramic pots with some type of greenery could work in the center.

This lamp is 36" tall Sometimes you can find adjustable buffet lamps