I think that the problem that you have is that you have too many flat surfaces and angles with nothing to lead your eye away from the blandness. You have grey concrete, grey roof, grey walls and the emotional response to that is a feeling of flatness and blah. The only thing that brings any kind of relief to the view are the plants and the steps that introduce different levels. My suggestion would be to look at adding texture, different levels for contrast to the flat surfaces and colours that unite those elements. Take a look at how the red lid on the rubbish bin pops out amongst the muted tones. Maybe bright red pots with taller (and healthier) looking plants in them on either side of the bench with a textural artwork or screen as mentioned above in between. You could be really bold and paint the steps red!, but don't do the pot plant suggestion if you do that. Once the air conditioning unit is removed I would put more boards down the front to cover up the gap and dirt underneath the pot plants. If you have the available space in front of that, place some seating and maybe a table, perhaps toning in with the grey tones but with a colour pot or cushions that tie in with the plants in the coloured (I suggested red, go with what you like) pots. I would also like to see what sort of door you have to access the room and yes, put the bins somewhere else if possible, they are unsightly.

Come stai Italiangal001 Magnifico ! I agree it looks great and should have matching grout. Are you going to have tiles from the front door to the living areas and passage, to give a flowing effect? otherwise it'll look like patchwork. https://www.nationaltiles.com.au/diy/blog/6-tips-for-better-grouting/

How long until you renovate your bathroom again? Something that is "quite trendy at the moment" works fine if you are a real estate flipper, but can start to look very dated after 10 years. If you are planning to use your bathroom for more than 10 years before the next renovation go classic, rather than trendy. Of course Beaumonts tiles want you go with something on-trend as that is how the suppliers market their products, so it will date, and somebody will want to replace it with something else that is on-trend in ten years time! Best of luck, Dr Retro of Dr Retro House Calls

If the hexagon tiles are to be the feature then the wall tiles should not draw attention to themselves. I would go with stacked horizontal as this will make the small room seem wider and it will be a simple grout pattern that won't try and compete with the hexagon mosaic. For small bathrooms understated and simple always looks cleaner. Best of luck, Dr Retro of Dr Retro House Calls