After installing bathroom vanities for many years, one tip I'd recommend is choosing a mirror that's slightly narrower than your vanity. For a 42-inch vanity, a 36–40 inch LED mirror usually provides the best proportions and leaves a clean reveal on each side.

Also, look for a mirror with:

• Front-facing LED lighting (better for makeup and shaving than backlit-only models)
• Adjustable color temperature (2700K–5000K)
• Dimmable brightness
• Anti-fog feature if it's your primary bathroom
• A CRI of 90+ for accurate color rendering

It's worth investing in a quality mirror since it's something you'll use every day, and good lighting can make a huge difference in both functionality and the overall look of the bathroom.