An interior designers trick is to install lighting in odd numbers, especially in threes. This can work well with lighting and can be applied to pendant lighting to add a modern and clean look.
If you know you have a viewing, make sure your dining table isnt cluttered with papers relating to life admin. You can go even go a step further and dress it for dinner to help clearly define the purpose of the space in the room.
Consider a designer pack-and-go dining table. Plywood is lightweight and durable, and a plywood table can be flat-packed and assembled as needed at home. Your dining table then can be packed up and moved as necessary. Plus it works well in a home with modern Nordic or contemporary Asian style.
It is likely that you will take the new items with you and so it wont be a wasted spend and could end up selling your home if it helps to make the room appeal to buyers. If you dont take them with you and the buyers like the space, you could offer to sell them - this is particularly handy for first-time buyers.