I would have thought the intent of mosaic feature was to highlight a feature by drawing your attention to it. I assume the bath and window is intended to be a feature, so why not tile above bath & around window to draw attention to that.

I think it would depend on the layout of the room and position of door and window and also possibly how bold or dark the feature tiles are. Do you have a photo or a plan?

Is that pic your actual place , or off a brochure ? The door is beautiful , the glass is great , I can't work out if the steps are polished concrete or marble , but basically it all looks classy ! And then that stacked stone looks like someone has run a picture through a black-and-white photocopier , and glued it on -- it looks fake ! Just a hint -- stacked stone doesn't have uniform crisp sharp corners -- and the grout lines should follow around corners too haha . Any sort of tiling may look as bad , or maybe better ; likewise powdercoated aluminium panels will look corporate ( not a good thing on a house IMO ) . If it was me , I wouldn't care if the 'allowance' was $60 -- I'd happily spend $6000 to go genuine ! It will make the whole place look better -- you only have 1 chance to make a first impression ! BTW -- is that $60 in total , or $60 a square metre -- neither will go far ? If budget really is that tight , how about just a plain render . Even thats probably more than $60 ! If thats all you can afford , so be it . But either at build time , or in future , if you have the $$$ , you could add 5 or 6 vertical 40mm x 40mm battens across the front of the column , same style and tone as the door , the full height ( maybe $600 ? ) and obviously referencing the door .

I would do the window wall only. The tile will be seen as soon as you enter bathroom. The entire vanity wall in these tiles, would be too much in my opinion.