My grands each have a walk in wardrobe in their bedrooms with a simple desk like that filling the space beside it and their rooms always look nice. There is then provision for a chest of drawers to be pushed under it if more storage is needed and one grand has a narrow box with shelves sideways at one end of the desk that allows readily accessible storage of frequently used items. This allows the full depth of the desk to be kept free for a computer screen, keyboard, tablet, and other reference material or whatever project the child might be working on and visually reduces clutter too. The beauty of a desk like that is its versatility - if you had a guest staying, you could hang a mirror on the wall and the desk would make a perfect vanity area for the guest.

I think the first task is to repaint the walls. In your pics the wall colours appear muddy, while the painting colours are bright and clear. The two are fighting each other. Neutral paint with a blue-grey undertone would work with the painting, the rug and the lounge setting. Don't make it a feature; let the artwork be the hero--as long as you love the artwork! The room as a whole is quite hard and needs some texture. Timber accessories would be a way of softening it. Maybe consider adding a couple of timber stools in one of the paler tones (oak?) to use as side tables. One way to soften the corner to the left of the TV unit would be to add some floppy baskets in a natural material like seagrass, again in a pale colour that would tone in with the timber. You could use the baskets for storage of magazines and books, which would also add texture. Greenery in the left-hand corner would also add texture. Maybe one large plant could be placed behind either one large basket or a couple of smaller baskets or softly textured containers. Otherwise, a row of three small plants somewhere on the TV unit would be cute. I agree with you about using blue tones from the painting as accents, but only if you tone down the blue. It has to be the same colour but much less powerful and overwhelming. You could also use some of the beautiful sea-green shades, but again with a softer tone rather than the strong colour used in the painting. Cushions in a combination of blues and greens--but much softer than those in the painting; they are way too strong-- would look great against the dark grey lounge setting. I would ignore the purple, black and grey when choosing accessories. Floor cushion(s) in blue or green, or patterned subtly in these colours, are another simple idea to add both colour and texture. Coloured glass or textured timber bowls, plate or vases on the TV unit would work and are often quite cheap to buy. Books always make a room look homely. Even a stack on a stool add interest and texture. Apart from the painting, most of these items can be bought quite inexpensively if you look around. Good luck!!

I think as long as the white tiles are the same in each room, and the turquoise and grey tiles are similar shape and size, then that, would be sufficient consistency. I actually like the idea. I liken it to having rooms painted a different colour, but each has the same flooring. By the way, I wish I had gone with my gut and tiled the laundry floor charcoal grey. Instead I listened to builder and hubby who said we should use white to make the room seem bigger. Just seems bigger for me to clean more often, in my opinion lol!

Decisions in this regard are (IMO) personal - it's not necessarily right and wrong. Most importantly it's about how you want to live. Architects and Designers (and also builders ;) ) sometimes (often!) forget that they are actually not the people who will live in the home and I've certainly had my fair share of natural/healthy debates & discussion (with clients) around specific room position options. At the end of the day I think we (Pro's) need to respect the fact that our personal opinions ultimately need to take a backseat to the client's, but there is nothing wrong with presenting the options and having a robust discussion about the pros and cons. I think it has to ultimately about your priorities but be clear/certain about the reasons about why you want something one way or the other.....a good designer should be able to negotiate the various elements creatively and help you put it all together so that your requirements are appropriately met/addressed and represented and reflecting within the design solution....hope this helps :) PD