After staring at your pics a few times I think I've figured out what's bothering me. The garden bed sticks forward. If you need it for the size of plants in the ground it might work but if you're only going to have pots you can line the edge up with the wall of the house I think? What is the depth of the garden bed? Colour and placement of the pots. The pots look terracotta and the brickwork looks more reddish, is that right? It doesn't look like it goes together. Maybe you can use those pots somewhere else where they aren't right beside the brickwork and get some pots for that location which are either darker and match the trims of the house or are lighter and contrast with the house more. I think the pots need to somehow relate to the windows. If that room could use some privacy or shade you could put two pots in front of the windows. If you want to preserve the view out then you could put three pots against the brickwork. The mulch. It looks too low for the edging. (What is the edging?) The colour, like with the pots, doesn't look like it goes with the rest. I'd go black pebbles or something light in a similar hue to the stone foundation feature. Or maybe scoria?

Good point! While stains are more prominent on neutral sheets, they're timeless, gender neutral and easier to accessorise. And yeah, bedlinen can be bleached. Alternatively you can mix up your own bleaching concoction using - 1/2 a cup of baking soda + your usual detergent + 1/2 white vinegar

White is a classic option when you have other competing colours in the space, otherwise aqua shades will work beautifully with both the cream & brass bed and the grey walls and flooring.

The bed needs more pillows with texture and patterns. Add black highlights in the accessories. Also get a lamp for the side table and a tray for accessories etc candles, vase. A few accessories for the desk like a hand-shaped jewelry holder etc. The things that will make the room less boring will be a rug with a visually appealing and exciting pattern (not a solid colour), a chair (the more interesting the better) , new bedding will create a focal point and accessories for the side table and desk. Go to freedom or adairs etc and they'll be staff members to help you choose out furniture, accessories, bedding etc. Show them your pictures and speak to them and they'll know how to help.