Here are a couple of suggestions for grouping artwork: [https://www.houzz.com.au/photos/domicile-id-contemporary-living-room-orange-county-phvw-vp~206513[(https://www.houzz.com.au/photos/domicile-id-contemporary-living-room-orange-county-phvw-vp~206513) [https://www.houzz.com.au/photos/lawrence-karol-modern-new-york-phvw-vp~631279[(https://www.houzz.com.au/photos/lawrence-karol-modern-new-york-phvw-vp~631279) And there are a number of stories on Houzz which may be of assistance, including the following: [https://www.houzz.com.au/magazine/how-to-use-artwork-to-make-buyers-fall-in-love-with-your-home-stsetivw-vs~34052353[(https://www.houzz.com.au/magazine/how-to-use-artwork-to-make-buyers-fall-in-love-with-your-home-stsetivw-vs~34052353) [https://www.houzz.com.au/magazine/what-we-can-learn-from-art-collectors-stsetivw-vs~43245980[(https://www.houzz.com.au/magazine/what-we-can-learn-from-art-collectors-stsetivw-vs~43245980) [https://www.houzz.com.au/magazine/curate-your-own-art-gallery-at-home-stsetivw-vs~31661125[(https://www.houzz.com.au/magazine/curate-your-own-art-gallery-at-home-stsetivw-vs~31661125) [https://www.houzz.com.au/magazine/whats-your-wall-gallery-personality-stsetivw-vs~43935117[(https://www.houzz.com.au/magazine/whats-your-wall-gallery-personality-stsetivw-vs~43935117)

LED lighting has made such a difference to how you can illuminate your home now and they give excellent light so you don't need the number of downlights as before. Strip lighting on stairs, for example, can look amazing and add wow to your home. Be guided by the experts above, or a good electrician should be able to give you practical advice. In some rooms one downlight can even be enough if you plan on having other feature lighting. Pendant lights for your bedroom will look great, but look at what wattage the lights you choose will take and whether you will need any other lights in the room. I have always been very minimalist in my home and try to keep to one light in each room for general access lighting and have alternative feature lighting for atmosphere. For example, I just have one LED downlight over my desk in my bedroom for when I'm working and a lamp each side of my bed for other times, and this is all I need. In my lounge room, I put two pendants, hung at different lengths in one corner of the room as a feature and I have two table lamps for when extra light is needed, but for watching TV or just generally entertaining and relaxing, the two pendants on their own are enough. Like you say, nothing is worse than over lighting a room, it totally loses any atmosphere. Your home theatre for example, could only need two downights for when you need a good light for cleaning and such, otherwise for general use, some wall sconces will give subtle lighting to the room. Have the two types of lights on separate switches naturally. One important thing I always suggest people be mindful of in work areas especially is to place lights so you don't work in your own shadow. One example is the kitchen sink or hotplates - put the light slightly to one side for better visibility.

Wall-mounted AC units have a directional outlet on them, so you'll be able to set it to push air across the room. 7.5 metres is a long way for it to travel though, probably won't go that far. The fans are not that powerful. As for the output size, the rule of thumb for these things is 100W per square metre, so 5kW is about right. With 7kW you should be okay. However your desk is right by a north-facing window so that's where the sun will come in and cook you, unless there's some shading. The suggestion for a fan is a valid one, and will probably make a big difference. I'm not sure is position 2 would really be a lot better since it's directed at the stair void anyway. Thermal comfort is always a tricky one since it's very subjective. Ultimately you'll just have to try it and see whether you feel too hot or cold. But overall I think it won't make too much difference which of the two locations the AC unit is in.

We too live in a cold winter climate with our bathrooms all on the southern side and faced similar issues as you do. One smaller bathroom does not have a window so we put in a Velux skylight which provides amazing natural light through the day. This may not be to your liking, especially if you have a period home. We also use heated towel rails and under tile heating (just enough to take the chill off and stop mould) in winter. Although we have a light in the shower recess, a bonus is the large fixed shower head with inbuilt LED, which at night gives the feeling of showering under moonlight. We chose light colours and mirrored recessed cabinets to reflect as much natural light as possible.