Studio Green is a near-black green with real depth, and it punishes the wrong company. The single best thing you can do is drench the room — walls, woodwork and ceiling all in Studio Green, varying the sheen rather than the colour. Estate Emulsion on walls, Estate Eggshell on trim. That's the look it was made for, and it's the one that turns a poky space into something properly enveloping.
If you want contrast on the trim, go very warm and slightly muddy — never cool, never brilliant white. A clean white alongside Studio Green looks like a mistake, all stark edges and no warmth. Reach instead for Farrow & Ball Au Lait (LRV 80) or Paper III from Paint & Paper Library (LRV 75.3). Both are soft, creamy and high enough in light to lift the trim without fighting the green.
For accents, this is where Studio Green comes alive. Deep plummy reds and oxblood in upholstery sit beautifully against it — think a velvet sofa or a pair of armchairs. Dulux Fuchsia Falls 2 (LRV 29.8) gives you that rich berry note if you want it on a smaller wall or in soft furnishings. And a warm dark brown like Mylands Cigar BH.20 (LRV 11.8) is gorgeous for joinery or a leather chair — it keeps the whole scheme grounded and tonal.
The "but what about" most people ask: can I do Studio Green with grey? Don't. Grey drains the warmth and leaves the green looking cold and flat. Keep everything on the warm side of the wheel.
Finish it with aged brass hardware — handles, light fittings, picture rails. Brass against this depth of green is a classic for a reason; it does the warming work that a cool metal like chrome simply can't.
Practical tip: test it in the actual room. Studio Green reads almost black in low light and shows its green only when daylight hits it, so live with a large sample on more than one wall before you commit.