Googling "makeup vanity lighting" should result in many sites that say side lighting is the most flattering and the most helpful for makeup applications. My own personal experience has shown that to be true. Fixtures should be about level (height)with your head. They can hang from the ceiling, attach to the mirror or the sides of the cabs/walls. I've had mirrors that extend the length of the vanity and are glued to the wall. My current mirror is glued and rests on top of the tile backsplash. My newly remodeled bathroom does NOT have side vanity lighting and I HATE it :( The only thing I'm dissatisfied with. Here is a picture of the mirror.

I'd go with a soft pearl or dove grey, but you could also do white. Are you conidering replacing the vanity counter? A stock grey laminate with a rounded corner from the big box store would at least be something that doesn't say "replace me right away." There are also special paints for coating laminate. I have not worked with them, so I don't know how easy they are to do well, but I've seen a couple of photos over the years. They are not a long term solution, but can buy a couple or few years, so they coud also help neutralize the blue for sale. If the sink and fixture are in good order, you could probaby reuse them. Either of those would be quick and low cost options that could make a big difference in how it shows. I think it is really a bigger issue that the wall paint and not necessarily more cost to address.

Roarah....I seriously considered medicine cabinets. We are using the Robern in the master and I'm excited as I have never had a medicine cabinet before. I hope I don't regret this decision. Hadn't even thought about the mess inside. Mostly dh's tbh. my boys are barely shaving and one is a terrible slob and I'm afraid it would be bad so ruled out the medicine cabinets for them. I think you are right. I like the oval better but the rectangle may be more appropriate than the oval. Thanks for the feedback.

Moen 26" Tall Tilting Oval Mirror from the Glenshire Collection Model:DN2692BN ... remove the existing mirror and install this swivel mirror. Yes, it should be centered in your eye sightline. it will cover some of the window, but will look fine. I have done this in past homes for natural light.