When it comes to "bang for your buck" nothing beats painting...however, coming in at a close second would be, my favorite improvement...updating the light fixtures. My experience has been that most sellers never even consider the light fixtures and what an impact they can make.
This is an area where a little money spent can make a huge difference and add tremendous perceived value to the home.
In our condo transformation, we replaced all the fixtures at a total cost of: $317.00. This price includes all the lights shown below, plus a bathroom light not shown.

FOYER

LIVING ROOM

DINING ROOM

KITCHEN (There are two of these)

MASTER BEDROOM
This condo is not for sale, but it is a great example of what changing the lights can do for increasing the value of the property. Which pictures would you rather have representing your property on MLS.
Original "Before" photos of entire condo
Part 2 Dog Hair in the Microwave
Part 3 A New Door and More Paint
Part 4 Kitchen Tile, Nasty Carpet, Nana's Dresser
Part 5 Nana's Dresser Goes Heavy Metal
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Those lights look great!
Another consideration is uplighting. You can get inexpensive canned lights and put them on timers - set them in corners behind furnishings.