I have sold quite a number of cars and bikes privately over the past few years ranging from £30k SUV's to £3k, ten year old Mercedes C180k with 125k miles.
I try to take the best photos I can, (I'm no David Bailey) choose a time at which people may be looking for that sort of vehicle....and most importantly price them realistically.
That doesn't mean trade price, just lower than you can buy the same thing on a shiny forecourt. Then I made sure they were as clean and tidy as they could be, not difficult as I simply will not drive a 'skip'
Guess what? They have all sold to the first veiwer....that's the last 8 vehicles
Did I sell them too cheap? No, just at a price people are prepared to pay.