I would go big on the glam factor with the mirror and pendants. heres a few thoughts on mirrors... I think a rococo style ornate mirror would be fabulous... https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod6440150&categoryId=cat10180016 https://www.perigold.com/decor/pdp/surya-wall-mirror-ya60277.html https://www.perigold.com/decor/pdp/howard-elliott-talida-mirror-p000904195.html https://www.perigold.com/decor/pdp/surya-modern-contemporary-beveled-wall-mirror-ya60110.html https://www.amazon.com/Howard-Elliott-Arlington-Baroque-Rectangle/dp/B00GO2YU68?ref_=fsclp_pl_dp_3

With that tile choice and faucet, a circular undermount sink would look incredible! Oval is a bit too outdated and rectangular, although on-trend, won't be the best pairing with the hexagonal tile. Best of luck!

Cosmetic updates to an existing powder room do not require you to bring it up to modern code. Ignore all that and make it pretty. Will you use a marble chair rail to separate the wall finishes? Painted rail? The little things are the hard ones. I like Jan's vanity. It's pretty much what you need. It'll look better with chrome than the faucet it is pictured with. I happen to love the old "builder gizmo, sunk into the wall" TP holders in a small bathroom. They can save valuable inches. If you can afford the space, something modern would be appropriate.

How are you going to light the room? Is the room exactly like the picture you show so that the 36" sink pretty much fills up the space and the toilet is opposite? With 8' ceilings 28" tall doesn't seem like it's going to be too high, but if you were going to put a fixture over the mirror you need to know what kind of fixture. As is shown in your inspiration picture, if you only have 4" of space on either side of the mirror you don't really have room for sconces, but you can do something similar to what is shown and hang them from the perpendicular walls. It's also possible to light a small powder room with an overhead fixture. Usually people aren't shaving or applying make-up in a powder room when you would want better lighting. Here are some pictures of different mirror shapes. If you don't like wallpaper, overlook it. :-)