Halt there! Before you adjudge the title as clickbait, I would like you to take a look at this blog post which is a bunch of DIY renovation tips for small spaces
Trust me, it won't take more than 3 minutes of your time to read the whole post. At the end, the author shares a particularly useful tip. Many home designers use the trick- making use of natural light.
Glasses are the best solution and if you have one at the ceiling that lets the light in, that would suffice. Also, larger shower mirrors with thick frames will aid in the renovation process.