3. Having only one source of light.
Relying only on overhead lighting is a common mistake. It might look alright in the morning or in the middle of the day, when there’s sunlight, but in the evening this type of lighting can make a room look grim. Lighting is very important, it creates ambience and a cozy atmosphere. Make sure you have some lights on the walls and buy a couple of standing lights for good measure.
4. Displaying too much memorabilia.
It’s perfectly fine to have a few pictures on the mantelpiece and a couple of things you brought home from a vacation, but there’s no need to put all of the crap you brought home from abroad on display. No one wants to see it and it’ll just end up gathering dust in the end.