Hi Aard -- Just have a minute but yes, I think using some kind of glass in those cabinets would be *great* -- reeded, frosted, or any kind of decorative. Not sure if you are doing a tile or wood wainscot in the non-shower area, but doing that and pairing it with some kind of liner or detailing that zips the eye around can help -- ditto for doing that on the floor with a tile border (if you are tiling the floor!). You can search on "small bath" here on the Bathrooms Forum (or my name) because I think there were some threads where I and others tried to brainstorm a bit. Got to scoot, but just posted my nearly-done reno -- you can take a look and see if anything appeals. Here is a link that might be useful: Vix's Rectilinear Romance Gweb bath reno thread

I agree with Cpartist"s layout and like moving the closet over as suggested by D M so that bedroom 3 has easier access to the bathroom. Do you have room to have the toilet face the tub and add a linen cabinet next to the toilet? How wide is the tub toilet area?

I think it would look great. There are a lot of examples if you google undermount bathroom vanity. https://www.homedepot.com/p/MR-Direct-Undermount-Porcelain-Bathroom-Sink-in-White-U1611-W/311963081 They do make less deep vanities. This is 18.5" deep and has 2 colors and many widths. https://www.homedepot.com/p/Home-Decorators-Collection-Maywell-30-in-W-x-18-5-in-D-x-34-4-in-H-Bath-Vanity-Cabinet-Only-in-Blue-HD2030P1O42-BU/314144506 You can also find them with the tops and sinks already done. https://www.homedepot.com/p/Glacier-Bay-Everdean-30-50-in-W-x-18-75-in-D-Bath-Vanity-in-White-with-Cultured-Marble-Vanity-Top-in-White-with-White-Basin-EV30P2-WH/311606054 https://www.homedepot.com/p/Glacier-Bay-Delridge-30-in-W-x-19-in-D-Bath-Vanity-in-Pearl-Gray-with-Cultured-Marble-Vanity-Top-in-White-with-White-Sink-DR30P2-PG/310163643 https://www.homedepot.com/p/Glacier-Bay-Modular-30-1-2-in-W-Bath-Vanity-in-White-with-Solid-Surface-Technology-Vanity-Top-in-Silver-Fox-with-White-Basin-PPDEC30-WHT/308411271

I am going to take better pictures to add to this once I get home, but here is an old picture of the bathroom before it was repainted that may help! And also adding one to show the layout. Really just looking for ALL ideas as far as how to make it functional but look nice as well. We are going to replace the vanity at some point which I know will make a big difference, but the rest of the bathroom I am stuck on.