Dogs look at tiger painting
Working with Evan Designs we used three of their 5 mm Bulb LEDs at the rear (directed towards the artwork), and four of their Chip LEDs in the front portion, one focused at each of the four walls, all of it mounted from the false ceiling (wiring concealed on its top). The three or so inches of space between the top of the false ceiling and the bottom of the actual room box top is concealed at the room box front by an appropriately-sized wood strip painted black.