Try a layout with the door shifted 100mm or so to right so that wou could fit bath or toilet on left side. Or move further to get shower on left with vanity over stair. Then cut out your elements and see how the work. Vanity can easily be suspended over stair.

In hindsight, it would have been better to recess the cabinet into the wall. Then you could have some side lighting that wills stick out past the cabinet and give you lighting so the missus can do her thing and you can shave and see everything. I agree with previous comments about pendant lighting. Possibly look at a pair of lights over the top of the cabinet pointing down coming out of the wall. I attached some pics with ideas. Otherwise a row of led downlights above the cabinet would also look nice.

hi we have about six months ago now, re done our bath room , similar size to yours, and , i can take some photos and email them to you , we have maximised space, and walls , put in a white stone bath under the window , it is a metre in width , with a cool water spout coming off the centre under the window we pu t afalse ledge in to sit , candles etc on , , we tiles floor to ceiling, off white , wall mirror cabnit with three mirrors , inset into the wall so its only sits out a we bit from the wall tiles , floating bath room vanity , so that it makes the floor space look bigger , . matching stone square basin sits ontop of the vanity to one side so plenty of room to sit all your bath room stuff when need be , seperate shower all tiled as well , with inset , shelves for shampoo etc, also , when you open the bath room door and walk in when you close the bath room door behind it next to the shower is a very narrow floor to ceiling shelvec for towels, now the hole is there we jaust havent got the shelves put in yet. , we gt loads of comments as the bth room dosent look small evn though it is , , most expensive item the sqwat extra wide stone bath , made to order basin / tap ware and shower spray thing ,oh and the white stone vanity which we had made to order as well , due to the sizing .

Great work Tracy. As a first time DIY(er) you have inspired me to tackle my early 80's ensuite! I REALLY want to paint my daggy tiles but I've had so many people advise me against it saying that they will scratch and wear far too quickly... Have you found this to be true with yours??