>>3011882>>3011974Arguing what's more important between composition, light and subject is like saying "what's the most important part of a car, the engine, the tires or the brakes?" They all contribute to the final image and and image is only as strong as its weakest component. Meaning if you have good comp and good subject but crappy lighting the lighting will bring it down.
Composition doesn't need to be intensely complex or nuanced. There just needs to be balance and without too many distractions. Leading lines and such can help but aren't always necessary.