I think just removing the wallpaper and and painting (instead of adding more wallpaper) would make a big difference (particularly in the bathroom). Also, I would get rid of the current mirror in the bathroom and replace with a smaller framed type, paint the cabinet and new hardware. Honestly, I think just paint will make a world of difference in your space.

Oh, okay, may need to clarify some more. If you get a new 2 seater in place of the 2 white chairs, fine, but no blue chair at all next to the 'new' 2 seater. Won't be right with a blue chair too. So what ones are you planning to recover?. If getting rid of part of it, not understanding. 2 different styles placed next to each other won't look right. I wouldn't like old blue fabrics next to new fabrics or next to 2 different styles of furniture. New 2 seater and old blue chair next to each other, not good :)

Paint a bright light color (maybe a gray with a green undertone to coordinate with the tile) and add a floating shelf and mirror for a place to drop keys and check yourself going out..

Hi Jennifer K, thanks for your comments. The photos you have posted are really lovely but not really suited to our environment and house, which I know is impossible to tell from one photo. We have built a modern farmhouse on 10 acres. That room looks out to beautiful green countryside and the river below. The dining room is a bit of a feature and is completely different to the rest of our relaxed lodgey style house but I don't want it to be too modern, if that makes sense. The photos have given me a few ideas so thank you so much for your help!