Begin with the viewing position
A beam that looks good from a ladder can reflect straight back at someone seated on the sofa. I check the artwork from the positions where people will actually see it.
Glass, glossy surfaces and textured work respond differently. The wall finish is part of the result too.
Aim before adding output
The beam angle, distance and position determine the area being lit. A narrower beam can create focus, but it can also leave an uneven patch if it is poorly matched to the work.
I trial an appropriate fitting and adjust it in place. The aim is a controlled relationship between the artwork and its surroundings, not a brighter wall by default.
Keep the work itself in mind
For valuable or light-sensitive pieces, ask a conservator about acceptable exposure before deciding on light levels and operating hours. More light is not always the right answer.
A separate control group makes the accent easier to tune. If the collection changes, a flexible arrangement can be useful without turning the room into a gallery installation.