depending on the size of the existing vanity it should be possible to have a similar new vanity or a custom unit made to replace the original but a chat with a plumber should be arranged to recommend suitable options and plan a schedule to remove the old and install the new, including any necessary waterproofing or tile repairs..btw careful removal could allow the original sink, taps and even the counter to be saved and recycled into a new vanity that matches the bathroom perfectly with the added option of being able to add different doors or drawers to the cabinet

It would be best to put tiles on the wall behind the sink. This will protect the wall from moisture etc. Small white tiles would be wonderful. It is your bathroom, so you can choose the tile that suits your tastes.

Thanks for the input! do you think that subway or 6x6 tiles would be better in the shower? Im not sure why but i was thinking that the 6x6 might be more consistent with the style of the basin. Dark blue or light blue for the accent tile in niche? Its a VERY small bathroom which was why I was leaning towards white floor. Trying to make it feel bigger. But maybe thats an error. This is the floor tile that I was considering. Too busy? I have to admit I like the dark blue tile of the last photo that Dreamer posted alot but was worried that a dark color would not work in a small space.

Mirror to go full width so the full vanity is utilised. No use having a mirror just over the basin, everyone using the bathroom will be standing behind each other doing their teeth, hair, makeup. A mirror the full width would allow three people to stand at the vanity at once.