Oh that’s so cool – I never thought about adding the colours on top of a greyscale! I’ve gotta try that 🙌🔥🩶🖤🤍

Yeah, it's somewhat common method! Greyscale first for values, and then tinting with layers, or using a gradient map. @ianfay.bsky.social has some process videos where he uses that method, and Alvaro Escobar is another of my fav artists who also works that way.