You have a lot of space here. Instead of the pedestal sink, look for a nice vanity. You can change the mirror to something larger and more modern. As for the lights, you could have sconces or two pendants on each side of the mirror. I am assuming that the tile stays. Otherwise, you can pick any tile.

Hello Orlac2, yes you could turn the bath round and have a smaller one.. Like a tubby.. You could also take out the bath and install a shower, have a wet room style with full tiling and back to wall sink and loo.. Could be a rather luxurious shower room.. but if the bath is required then why not look at getting a Tubby Torre by Albion. They have a whole range but this is a favourite.. It can be painted any colour you like.. I like the copper colour.. You get a really fantastic soak and it's a beautiful little tub! As well as a shower. : ))

Beautiful bathroom! Fabulous Freestanding tub!

If it was me, I would centre it and only silicone the back. I understand your concerns about water going down the side. Realistically, though, as you will only be washing your hands and maybe teeth in it, there is unlikely to be much water gushing about. To detract from the fact there is not as much space on either side of sink, I would have carpenter either wall mount or put legs on the cabinet so there is space underneath and the unit doesn't look too chunky!