Maybe some floating shelves on the wall against which the bed will rest? Obviously taking care to ensure that they're not at a height where your daughter will hit her head getting in or out of bed. Or you could move the bed to the wall with the window which would enable you to put a taller than standard bedside table (or even the desk) near the head of the bed. Moving the desk might open up the space at the door for entry/exit as it looks a little cramped at the moment with the design and wardrobe.

My pizza baking stones. I have individual size and one large. I'm afraid they'll break if I put them anywhere else. Most times I leave them in when I'm cooking as they retain the heat, but its not hard to take them out if I need the space. Also, it encourages me to use them more often, they're pretty wonderful things for heating up sandwiches vs frying sandwiches to melt the cheese!. I also use them for bread.

Looking at your photos I noticed you have lots of little artwork scattered here and there. They don’t look right at the moment . If group all of them in a gallery like formation on the wall above your dining table you will have a focal point. There is no need for a frame on each wall, just one focal point is enough. Also there seems inadequate amount of storage in the kitchen, you could add some wall cabinets maybe in different colour to add a bit of interest and height to the room, at the moment everything is on same level. I realised you didn’t ask opinion on this but anyway I don’t mean to offend.

My advice is to think about the working/function as you need it for your family. Prioritise that (as a starting point) and get that happening somewhat free of a "box" shape extension and see how that all sits - it's like you're trying to squeeze it all in to a specific shape and then struggling with certain details....you're suggesting/entertaining ideas like a functional laundry/bag drop zone etc which 100% is important/relevant for a busy family of 4. The problem seems that there hasn't been true clarity on the function/requirements before the design has been proposed. Is it too small? Well it depends on how exactly you intend on using it - how many people need to be able to sit at the table or on the lounge etc..this will dictate scaling - whether or not you'd like a butlers pantry or not. Is the 3rd toilet needed? Well ultimately nobody can tell you that one way or the other - you will know whether functionally that is a requirement necessary for your family - all these are questions you will have (or need to establish) an opinion/position on one way or another and then (should) be able to work through (more effectively) & resolve with the architect whom you've engaged.....you are obviously staging the project which can be logical/necessary, and given this there may in fact be alternative and arguably more cost effective design options available for you (such as a 2nd stage "clean" extension for a master suite), but realistically that involves greater understanding/information of the site/context and your particular budget in order to provide specific advice/suggestions as to how best to achieve your goals...Good luck :) PD