Hi all, I could really use some suggestions as to where I might put some 3.5 inch recessed lights in my bathroom ceiling... I've attached a jpg of the layout. Above the vanity there is a 4 piece light set, and there is a light in the shower, it is just the rest of the bathroom I have to worry about. If you could take a look at the picture (It's to scale as much as possible, with the length being 15.7 feet total) and give me some suggestions, I'd appreciate it!

I am planning to upgrade the backsplash in my kitchen using leftover ceramic tile from a recent shower build I completed in my master bathroom. When I redid the shower, I was meticulous about using a water-resistant backer board, 2 coats of Red Guard, etc. to ensure everything was done properly and avoid moisture problems in the future... But, when I began to remove the old porcelain tile in the kitchen, I noticed it' s simply mounted on plywood. My question is whether or not installing on this material is ok since the backsplash tile is essentially decorative and not going to be constantly exposed to water like the shower? Or, do I need to cut that out as well as the drywall behind it and replace those materials with the water-resistant backer board as I did with the shower? Thank you in advance for the information. I always find responses on this forum invaluable.