Sorry but I fail to see the relevance or relationship of this tile to the rest of what is going on. The stained glass window is a strong feature and there appears to be no relationship or relevance to this. It is so close and yet so far away from the main wall tile it looks like a tonal mistake. If it is a Kids bathroom I fail to see what age group of kids would find this attractive or exciting? I must be missing something here? Every individual element needs to have a reason for being there for the whole space to work. Very often individual elements look great on their own bot look a shambles in the wrong mix so unless there is a good reason for this choice from a design perspective it it may end up being a good element in the wrong place. Happy renovating

wow I love all these suggestions. I was going to suggest a grasscloth wallpaper, because it has wonderful texture. But I'm quite taken with the shelves idea now.

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.

Looks good. Before I read through discussion, I had these thoughts. You could look at painting on the front of the wall only, not in the porch/entranceway area underneath, double strength of main colour. So you could as an option get a test pot of Dulux double Self Destruct or even triple. I would not use Monument, or similar to the roof color as it will disappear into the roof. I also think the front fence would look better painted a stronger colour from your existing but as it seems it has just been painted perhaps you could do that, when and if you liked, to cut down expense. On the Dulux website they also give you colours that look good with Self Destruct. (Picture below). Another option is look towards going bold like a strong blue or blue green. Something like in the picture. That's my feature wall, Resene Billabong. ...or a dirty purple or a blood red. It's starting to get really personal of what your tastes are. Perhaps you could Half or Quarter the main house colour in the entranceway so it still flows but gives you more light. Exciting stuff!