Very cheap and simple upgrades:
Target or ikea,
Get 3-4 dispensers like this:
Have them IDENTICAL.
THIS is where you put your lotion, handsoap, mouthwash, etc. the big softsoap or jergens bottles with labels, keep them shyts under the sink. This alone will have your bathroom looking sleek.
Also get a few handtowels, put them in a basket, and have a matching paper towel dispenser as well on deck.
Keep bathmats black and simple
Keep shower curtains clean and HAVE A CURTAIN OVER THE PLASTIC SHEET, and have that be simple (black and white, or cream and black)
No fukkin designs
Nothing else matters besides cleanliness. Clean everything with alcohol, and the tub with Bleach