Hate to despoil the trek mythos, but in the The Next Generation sequel series before Discovery and Picard, the main visual difference was that the Romulan brow was more prominent. Watch the visual differences between enterprises T'pol and TNG's Romulan captain Picard plays chess with so often, Tomulok. Vulcans only look different to humans by the ears whilst the Romulan brow ridge would give them away in a flat second. And no I am by no means confusing them with Klingons; watch the videos where they talk about the makeup actors have had to have placed on them to play Romulans.
Rich
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