I would also try to de-clutter the house. The outside and landscaping is PERFECT. Now make the interior follow that trend.
Not that you have too much furniture, but get a storage unit and leave out only the chairs/tables/couches that are absolutely needed.
It really makes a difference in how big the home shows. The big sectional is nice for watching football on Sunday, but takes up a lot of space. Go to a professional open house and see how much furniture is in a model home and try and copy that style.
Nothing wrong with the red in the kitchen, but a more neutral color would show better. Get rid of the stand in the kitchen with the microwave too if you can.
Make it the home look clean, well kept up and look sort of generic, so people can imagine themselves living there. Take down the family photos and just have a few simple wall hangings. Your family (I am sure) is nice, but you are only reminding someone that this isn't their home.
Women are huge deciders on homes, women like closet storage, nice bathrooms, and well equip'd kitchens. It is all relative to the price point, but if you do any upgrades/remodels try to hit these points.