georgi has some very good ideas and is on the ball in regards to if you want to keep it to a low budget but you have stated that you want a complete change but the toilet has to stay where it is. So i am going forward with the complete change, modern look without being extravagant. I would remove all tiles, vanity, pictures, hand rails, toilet and curtains. I would get rid of the shower and put a new one over the bath tub. This will free up space and make the bath area dual purpose. Bigger bathroom already! I would then remove the current porcelain tub and make it into a planter outside or sell it. Extend the bathtub walls higher to about 50cm and out to where the brick work butts the current vanity's position. Also extend slightly the bath wall nearest the toilet so you can install glass near the window. You will end up with a slightly bigger bath area. georgi has the right idea with the tiles placement. My preference although you can change it would be to get a light slate or sandstone coloured tiles. Either go all white tiles for floor and walls or mix it like sandstone colour on the floor with white on the walls. Tile either up to 2m up the wall or to the ceiling if you have a bit of extra cash for a clean stylish look. Tile the bath tub walls too so you end up with something similar to a roman bath with shower. The shower head should be of enough distance away that water splashes are minimal on the window sill. Now install a frame less glass partition between the toilet and the wall near the current vanity. Install a new toilet - white modern look with a fuller body than the one you currently have. Now for the new vanity.... These are just ideas and are ones with a tub installed. The roman styled gives you more room if you want to have a bath and is not as slippery when getting in or out. Also toddlers can hold the side and stand up without slipping over and hurting themselves. Cleaning is not a issue if normal maintenance like wiping down glass and tile after every shower/bath. I have taken the wiping down routine for the last 10 years. I only had to clean the grout once every 3 to 4 years and it doesnt stain heavily. Lighting i like the ideas of georgi. The mirrors can also double as storage cabinets.

Ideally you would want 900-1000mm clear space in front of your vanity and for walkways, unfortunately we don't live in an ideal world and have to work with what we have. 700mm would be the absolute minimum width for a walkway to still allow reasonable passage, although I would be reluctant to go this tight. A floating vanity will help the space look larger and storage can be included in a mirrored shaving cabinet or mirror with shallow shelf above the vanity.

How's it going ? U in yet? You loving the country life? Great flower stalls on that road, or use to be! $2 bunches.. Can you look at my 'tiny house' the size of your powder room..lol https://www.houzz.com.au/discussions/6042198/those-with-an-eye-for-colour If you have any other ideas. I got some good ones already. But throw any more around that you think might work.

@HU-319610855 I’m not saying this to be even the slightest bit contradictory, so please don’t take it that way. We had seperate everything. Doors, walls and divisions everywhere. We pulled it all out and went combo. We‘ve never had an issue with conflicting use, and we love the feeling of extra space and openness it created. I’m sure it all depends on your household. :-)