Could you use the same glass as behind your cooktop for behind the sink? Kitchens generally use the same material for all the splashbacks or it can look disjointed. Have a look at photos of kitchens on this site to get some ideas.

Love large floor tiles and floor to ceiling tiles. Is feature wall the window wall ? I'd choose everything to harmonise with benchtop prob white wall save contrast feature and love taupe beige floor tiles and beige white and black combo Would black vanity suit your benchtop I love my laminate black gloss vanity with self close drawers and caroma opal basin (white porcelain) I also like wall and floor tiles same large size perhaps smaller in shower floor for non slip or "gritty" floor tiles eg lappato

A good indicator for the Niche is the photo you posted, some also add a smaller lower one for ladies to put their foot into for shaving legs. Is your skylight directly above where you plan the shower, if so it would also look good with the rest of the ceiling dropped to 2.4m as in the photo. Still think it's better not to tile next to the window, was it the niche that made you decide on that.

Hi Pele - I hope you don't mind, but to my mind the thing that immediately jumps out at me as not fitting is the colour of the orange terrace tiles! The wall colour and roof colour seem in the earth/cool ochre range, and sort of complement the cool grey driveway even though they are different. The terrace tiles being bright orange clash! If you do/don't have the budget, I would prioritise painting or staining these tiles the Basalt colour which is a deeper grey like bluestone! Or even better switch your budget to retiling this area with a deeper grey or bluestone exterior tile. Add a few plant pots - and I love your timber garage door and possibly timber balustrade - and it would be dramatically transformed! I think this would be a better impact-for-dollar than painting the roof tiles which look to me to be in good condition. Good Luck!