We've a close relative that is a successful real estate agent here in the U.S. Although the markets are probably significantly different, our relative has certain "rules" that are set in place before showing a prospective buyer a client's home.
Firstly, all of the interior ligths are turned on. A fresh bouqet of flowers is placed on the kitchen counter as well as in the master or largest bath... little touches that add warmth and invitation.
You say you've removed clutter, but have you removed all of the personal items? Family pictures, awards, trophies, the bathrobe behind the bedroom or bath door are all major detractors. The sales agents job is to show the house in the best possibile light (no pun intended) but also to reinforce the 'feeling' of the prospective buyer that this could easily be their house... not just moving into someone else's house. Ownership is a very private, personal thing and a real focus for a good estate sales person. (Your bedspread is clean, neat and without wrinkles isn't it?).... Best of luck!